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    // This file is @generated by syn-internal-codegen.
    // It is not intended for manual editing.

    #![allow(unused_variables)]
    #[cfg(any(feature = "full", feature = "derive"))]
    use crate::gen::helper::visit_mut::*;
    #[cfg(any(feature = "full", feature = "derive"))]
    use crate::punctuated::Punctuated;
    use crate::*;
    use proc_macro2::Span;
    #[cfg(feature = "full")]
    macro_rules! full {
        ($e:expr) => {
            $e
        };
    }
    #[cfg(all(feature = "derive", not(feature = "full")))]
    macro_rules! full {
        ($e:expr) => {
            unreachable!()
        };
    }
    macro_rules! skip {
        ($($tt:tt)*) => {};
    }
    /// Syntax tree traversal to mutate an exclusive borrow of a syntax tree in
    /// place.
    ///
    /// See the [module documentation] for details.
    ///
    /// [module documentation]: self
    ///
    /// *This trait is available only if Syn is built with the `"visit-mut"` feature.*
    pub trait VisitMut {
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_abi_mut(&mut self, i: &mut Abi) {
            visit_abi_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_angle_bracketed_generic_arguments_mut(
            &mut self,
            i: &mut AngleBracketedGenericArguments,
        ) {
            visit_angle_bracketed_generic_arguments_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_arm_mut(&mut self, i: &mut Arm) {
            visit_arm_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_attr_style_mut(&mut self, i: &mut AttrStyle) {
            visit_attr_style_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_attribute_mut(&mut self, i: &mut Attribute) {
            visit_attribute_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_bare_fn_arg_mut(&mut self, i: &mut BareFnArg) {
            visit_bare_fn_arg_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_bin_op_mut(&mut self, i: &mut BinOp) {
            visit_bin_op_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_binding_mut(&mut self, i: &mut Binding) {
            visit_binding_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_block_mut(&mut self, i: &mut Block) {
            visit_block_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_bound_lifetimes_mut(&mut self, i: &mut BoundLifetimes) {
            visit_bound_lifetimes_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_const_param_mut(&mut self, i: &mut ConstParam) {
            visit_const_param_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_constraint_mut(&mut self, i: &mut Constraint) {
            visit_constraint_mut(self, i);
        }
        #[cfg(feature = "derive")]
        fn visit_data_mut(&mut self, i: &mut Data) {
            visit_data_mut(self, i);
        }
        #[cfg(feature = "derive")]
        fn visit_data_enum_mut(&mut self, i: &mut DataEnum) {
            visit_data_enum_mut(self, i);
        }
        #[cfg(feature = "derive")]
        fn visit_data_struct_mut(&mut self, i: &mut DataStruct) {
            visit_data_struct_mut(self, i);
        }
        #[cfg(feature = "derive")]
        fn visit_data_union_mut(&mut self, i: &mut DataUnion) {
            visit_data_union_mut(self, i);
        }
        #[cfg(feature = "derive")]
        fn visit_derive_input_mut(&mut self, i: &mut DeriveInput) {
            visit_derive_input_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_expr_mut(&mut self, i: &mut Expr) {
            visit_expr_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_array_mut(&mut self, i: &mut ExprArray) {
            visit_expr_array_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_assign_mut(&mut self, i: &mut ExprAssign) {
            visit_expr_assign_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_assign_op_mut(&mut self, i: &mut ExprAssignOp) {
            visit_expr_assign_op_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_async_mut(&mut self, i: &mut ExprAsync) {
            visit_expr_async_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_await_mut(&mut self, i: &mut ExprAwait) {
            visit_expr_await_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_expr_binary_mut(&mut self, i: &mut ExprBinary) {
            visit_expr_binary_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_block_mut(&mut self, i: &mut ExprBlock) {
            visit_expr_block_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_box_mut(&mut self, i: &mut ExprBox) {
            visit_expr_box_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_break_mut(&mut self, i: &mut ExprBreak) {
            visit_expr_break_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_expr_call_mut(&mut self, i: &mut ExprCall) {
            visit_expr_call_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_expr_cast_mut(&mut self, i: &mut ExprCast) {
            visit_expr_cast_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_closure_mut(&mut self, i: &mut ExprClosure) {
            visit_expr_closure_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_continue_mut(&mut self, i: &mut ExprContinue) {
            visit_expr_continue_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_expr_field_mut(&mut self, i: &mut ExprField) {
            visit_expr_field_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_for_loop_mut(&mut self, i: &mut ExprForLoop) {
            visit_expr_for_loop_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_group_mut(&mut self, i: &mut ExprGroup) {
            visit_expr_group_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_if_mut(&mut self, i: &mut ExprIf) {
            visit_expr_if_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_expr_index_mut(&mut self, i: &mut ExprIndex) {
            visit_expr_index_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_let_mut(&mut self, i: &mut ExprLet) {
            visit_expr_let_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_expr_lit_mut(&mut self, i: &mut ExprLit) {
            visit_expr_lit_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_loop_mut(&mut self, i: &mut ExprLoop) {
            visit_expr_loop_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_macro_mut(&mut self, i: &mut ExprMacro) {
            visit_expr_macro_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_match_mut(&mut self, i: &mut ExprMatch) {
            visit_expr_match_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_method_call_mut(&mut self, i: &mut ExprMethodCall) {
            visit_expr_method_call_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_expr_paren_mut(&mut self, i: &mut ExprParen) {
            visit_expr_paren_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_expr_path_mut(&mut self, i: &mut ExprPath) {
            visit_expr_path_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_range_mut(&mut self, i: &mut ExprRange) {
            visit_expr_range_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_reference_mut(&mut self, i: &mut ExprReference) {
            visit_expr_reference_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_repeat_mut(&mut self, i: &mut ExprRepeat) {
            visit_expr_repeat_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_return_mut(&mut self, i: &mut ExprReturn) {
            visit_expr_return_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_struct_mut(&mut self, i: &mut ExprStruct) {
            visit_expr_struct_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_try_mut(&mut self, i: &mut ExprTry) {
            visit_expr_try_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_try_block_mut(&mut self, i: &mut ExprTryBlock) {
            visit_expr_try_block_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_tuple_mut(&mut self, i: &mut ExprTuple) {
            visit_expr_tuple_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_type_mut(&mut self, i: &mut ExprType) {
            visit_expr_type_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_expr_unary_mut(&mut self, i: &mut ExprUnary) {
            visit_expr_unary_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_unsafe_mut(&mut self, i: &mut ExprUnsafe) {
            visit_expr_unsafe_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_while_mut(&mut self, i: &mut ExprWhile) {
            visit_expr_while_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_expr_yield_mut(&mut self, i: &mut ExprYield) {
            visit_expr_yield_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_field_mut(&mut self, i: &mut Field) {
            visit_field_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_field_pat_mut(&mut self, i: &mut FieldPat) {
            visit_field_pat_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_field_value_mut(&mut self, i: &mut FieldValue) {
            visit_field_value_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_fields_mut(&mut self, i: &mut Fields) {
            visit_fields_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_fields_named_mut(&mut self, i: &mut FieldsNamed) {
            visit_fields_named_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_fields_unnamed_mut(&mut self, i: &mut FieldsUnnamed) {
            visit_fields_unnamed_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_file_mut(&mut self, i: &mut File) {
            visit_file_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_fn_arg_mut(&mut self, i: &mut FnArg) {
            visit_fn_arg_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_foreign_item_mut(&mut self, i: &mut ForeignItem) {
            visit_foreign_item_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_foreign_item_fn_mut(&mut self, i: &mut ForeignItemFn) {
            visit_foreign_item_fn_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_foreign_item_macro_mut(&mut self, i: &mut ForeignItemMacro) {
            visit_foreign_item_macro_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_foreign_item_static_mut(&mut self, i: &mut ForeignItemStatic) {
            visit_foreign_item_static_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_foreign_item_type_mut(&mut self, i: &mut ForeignItemType) {
            visit_foreign_item_type_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_generic_argument_mut(&mut self, i: &mut GenericArgument) {
            visit_generic_argument_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_generic_method_argument_mut(&mut self, i: &mut GenericMethodArgument) {
            visit_generic_method_argument_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_generic_param_mut(&mut self, i: &mut GenericParam) {
            visit_generic_param_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_generics_mut(&mut self, i: &mut Generics) {
            visit_generics_mut(self, i);
        }
        fn visit_ident_mut(&mut self, i: &mut Ident) {
            visit_ident_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_impl_item_mut(&mut self, i: &mut ImplItem) {
            visit_impl_item_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_impl_item_const_mut(&mut self, i: &mut ImplItemConst) {
            visit_impl_item_const_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_impl_item_macro_mut(&mut self, i: &mut ImplItemMacro) {
            visit_impl_item_macro_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_impl_item_method_mut(&mut self, i: &mut ImplItemMethod) {
            visit_impl_item_method_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_impl_item_type_mut(&mut self, i: &mut ImplItemType) {
            visit_impl_item_type_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_index_mut(&mut self, i: &mut Index) {
            visit_index_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_mut(&mut self, i: &mut Item) {
            visit_item_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_const_mut(&mut self, i: &mut ItemConst) {
            visit_item_const_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_enum_mut(&mut self, i: &mut ItemEnum) {
            visit_item_enum_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_extern_crate_mut(&mut self, i: &mut ItemExternCrate) {
            visit_item_extern_crate_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_fn_mut(&mut self, i: &mut ItemFn) {
            visit_item_fn_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_foreign_mod_mut(&mut self, i: &mut ItemForeignMod) {
            visit_item_foreign_mod_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_impl_mut(&mut self, i: &mut ItemImpl) {
            visit_item_impl_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_macro_mut(&mut self, i: &mut ItemMacro) {
            visit_item_macro_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_macro2_mut(&mut self, i: &mut ItemMacro2) {
            visit_item_macro2_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_mod_mut(&mut self, i: &mut ItemMod) {
            visit_item_mod_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_static_mut(&mut self, i: &mut ItemStatic) {
            visit_item_static_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_struct_mut(&mut self, i: &mut ItemStruct) {
            visit_item_struct_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_trait_mut(&mut self, i: &mut ItemTrait) {
            visit_item_trait_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_trait_alias_mut(&mut self, i: &mut ItemTraitAlias) {
            visit_item_trait_alias_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_type_mut(&mut self, i: &mut ItemType) {
            visit_item_type_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_union_mut(&mut self, i: &mut ItemUnion) {
            visit_item_union_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_item_use_mut(&mut self, i: &mut ItemUse) {
            visit_item_use_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_label_mut(&mut self, i: &mut Label) {
            visit_label_mut(self, i);
        }
        fn visit_lifetime_mut(&mut self, i: &mut Lifetime) {
            visit_lifetime_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_lifetime_def_mut(&mut self, i: &mut LifetimeDef) {
            visit_lifetime_def_mut(self, i);
        }
        fn visit_lit_mut(&mut self, i: &mut Lit) {
            visit_lit_mut(self, i);
        }
        fn visit_lit_bool_mut(&mut self, i: &mut LitBool) {
            visit_lit_bool_mut(self, i);
        }
        fn visit_lit_byte_mut(&mut self, i: &mut LitByte) {
            visit_lit_byte_mut(self, i);
        }
        fn visit_lit_byte_str_mut(&mut self, i: &mut LitByteStr) {
            visit_lit_byte_str_mut(self, i);
        }
        fn visit_lit_char_mut(&mut self, i: &mut LitChar) {
            visit_lit_char_mut(self, i);
        }
        fn visit_lit_float_mut(&mut self, i: &mut LitFloat) {
            visit_lit_float_mut(self, i);
        }
        fn visit_lit_int_mut(&mut self, i: &mut LitInt) {
            visit_lit_int_mut(self, i);
        }
        fn visit_lit_str_mut(&mut self, i: &mut LitStr) {
            visit_lit_str_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_local_mut(&mut self, i: &mut Local) {
            visit_local_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_macro_mut(&mut self, i: &mut Macro) {
            visit_macro_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_macro_delimiter_mut(&mut self, i: &mut MacroDelimiter) {
            visit_macro_delimiter_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_member_mut(&mut self, i: &mut Member) {
            visit_member_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_meta_mut(&mut self, i: &mut Meta) {
            visit_meta_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_meta_list_mut(&mut self, i: &mut MetaList) {
            visit_meta_list_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_meta_name_value_mut(&mut self, i: &mut MetaNameValue) {
            visit_meta_name_value_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_method_turbofish_mut(&mut self, i: &mut MethodTurbofish) {
            visit_method_turbofish_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_nested_meta_mut(&mut self, i: &mut NestedMeta) {
            visit_nested_meta_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_parenthesized_generic_arguments_mut(
            &mut self,
            i: &mut ParenthesizedGenericArguments,
        ) {
            visit_parenthesized_generic_arguments_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_pat_mut(&mut self, i: &mut Pat) {
            visit_pat_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_pat_box_mut(&mut self, i: &mut PatBox) {
            visit_pat_box_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_pat_ident_mut(&mut self, i: &mut PatIdent) {
            visit_pat_ident_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_pat_lit_mut(&mut self, i: &mut PatLit) {
            visit_pat_lit_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_pat_macro_mut(&mut self, i: &mut PatMacro) {
            visit_pat_macro_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_pat_or_mut(&mut self, i: &mut PatOr) {
            visit_pat_or_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_pat_path_mut(&mut self, i: &mut PatPath) {
            visit_pat_path_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_pat_range_mut(&mut self, i: &mut PatRange) {
            visit_pat_range_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_pat_reference_mut(&mut self, i: &mut PatReference) {
            visit_pat_reference_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_pat_rest_mut(&mut self, i: &mut PatRest) {
            visit_pat_rest_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_pat_slice_mut(&mut self, i: &mut PatSlice) {
            visit_pat_slice_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_pat_struct_mut(&mut self, i: &mut PatStruct) {
            visit_pat_struct_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_pat_tuple_mut(&mut self, i: &mut PatTuple) {
            visit_pat_tuple_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_pat_tuple_struct_mut(&mut self, i: &mut PatTupleStruct) {
            visit_pat_tuple_struct_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_pat_type_mut(&mut self, i: &mut PatType) {
            visit_pat_type_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_pat_wild_mut(&mut self, i: &mut PatWild) {
            visit_pat_wild_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_path_mut(&mut self, i: &mut Path) {
            visit_path_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_path_arguments_mut(&mut self, i: &mut PathArguments) {
            visit_path_arguments_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_path_segment_mut(&mut self, i: &mut PathSegment) {
            visit_path_segment_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_predicate_eq_mut(&mut self, i: &mut PredicateEq) {
            visit_predicate_eq_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_predicate_lifetime_mut(&mut self, i: &mut PredicateLifetime) {
            visit_predicate_lifetime_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_predicate_type_mut(&mut self, i: &mut PredicateType) {
            visit_predicate_type_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_qself_mut(&mut self, i: &mut QSelf) {
            visit_qself_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_range_limits_mut(&mut self, i: &mut RangeLimits) {
            visit_range_limits_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_receiver_mut(&mut self, i: &mut Receiver) {
            visit_receiver_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_return_type_mut(&mut self, i: &mut ReturnType) {
            visit_return_type_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_signature_mut(&mut self, i: &mut Signature) {
            visit_signature_mut(self, i);
        }
        fn visit_span_mut(&mut self, i: &mut Span) {
            visit_span_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_stmt_mut(&mut self, i: &mut Stmt) {
            visit_stmt_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_trait_bound_mut(&mut self, i: &mut TraitBound) {
            visit_trait_bound_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_trait_bound_modifier_mut(&mut self, i: &mut TraitBoundModifier) {
            visit_trait_bound_modifier_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_trait_item_mut(&mut self, i: &mut TraitItem) {
            visit_trait_item_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_trait_item_const_mut(&mut self, i: &mut TraitItemConst) {
            visit_trait_item_const_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_trait_item_macro_mut(&mut self, i: &mut TraitItemMacro) {
            visit_trait_item_macro_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_trait_item_method_mut(&mut self, i: &mut TraitItemMethod) {
            visit_trait_item_method_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_trait_item_type_mut(&mut self, i: &mut TraitItemType) {
            visit_trait_item_type_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_mut(&mut self, i: &mut Type) {
            visit_type_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_array_mut(&mut self, i: &mut TypeArray) {
            visit_type_array_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_bare_fn_mut(&mut self, i: &mut TypeBareFn) {
            visit_type_bare_fn_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_group_mut(&mut self, i: &mut TypeGroup) {
            visit_type_group_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_impl_trait_mut(&mut self, i: &mut TypeImplTrait) {
            visit_type_impl_trait_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_infer_mut(&mut self, i: &mut TypeInfer) {
            visit_type_infer_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_macro_mut(&mut self, i: &mut TypeMacro) {
            visit_type_macro_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_never_mut(&mut self, i: &mut TypeNever) {
            visit_type_never_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_param_mut(&mut self, i: &mut TypeParam) {
            visit_type_param_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_param_bound_mut(&mut self, i: &mut TypeParamBound) {
            visit_type_param_bound_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_paren_mut(&mut self, i: &mut TypeParen) {
            visit_type_paren_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_path_mut(&mut self, i: &mut TypePath) {
            visit_type_path_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_ptr_mut(&mut self, i: &mut TypePtr) {
            visit_type_ptr_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_reference_mut(&mut self, i: &mut TypeReference) {
            visit_type_reference_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_slice_mut(&mut self, i: &mut TypeSlice) {
            visit_type_slice_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_trait_object_mut(&mut self, i: &mut TypeTraitObject) {
            visit_type_trait_object_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_type_tuple_mut(&mut self, i: &mut TypeTuple) {
            visit_type_tuple_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_un_op_mut(&mut self, i: &mut UnOp) {
            visit_un_op_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_use_glob_mut(&mut self, i: &mut UseGlob) {
            visit_use_glob_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_use_group_mut(&mut self, i: &mut UseGroup) {
            visit_use_group_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_use_name_mut(&mut self, i: &mut UseName) {
            visit_use_name_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_use_path_mut(&mut self, i: &mut UsePath) {
            visit_use_path_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_use_rename_mut(&mut self, i: &mut UseRename) {
            visit_use_rename_mut(self, i);
        }
        #[cfg(feature = "full")]
        fn visit_use_tree_mut(&mut self, i: &mut UseTree) {
            visit_use_tree_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_variadic_mut(&mut self, i: &mut Variadic) {
            visit_variadic_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_variant_mut(&mut self, i: &mut Variant) {
            visit_variant_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_vis_crate_mut(&mut self, i: &mut VisCrate) {
            visit_vis_crate_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_vis_public_mut(&mut self, i: &mut VisPublic) {
            visit_vis_public_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_vis_restricted_mut(&mut self, i: &mut VisRestricted) {
            visit_vis_restricted_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_visibility_mut(&mut self, i: &mut Visibility) {
            visit_visibility_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_where_clause_mut(&mut self, i: &mut WhereClause) {
            visit_where_clause_mut(self, i);
        }
        #[cfg(any(feature = "derive", feature = "full"))]
        fn visit_where_predicate_mut(&mut self, i: &mut WherePredicate) {
            visit_where_predicate_mut(self, i);
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_abi_mut<V>(v: &mut V, node: &mut Abi)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.extern_token.span);
        if let Some(it) = &mut node.name {
            v.visit_lit_str_mut(it);
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_angle_bracketed_generic_arguments_mut<V>(
        v: &mut V,
        node: &mut AngleBracketedGenericArguments,
    )
    where
        V: VisitMut + ?Sized,
    {
        if let Some(it) = &mut node.colon2_token {
            tokens_helper(v, &mut it.spans);
        }
        tokens_helper(v, &mut node.lt_token.spans);
        for el in Punctuated::pairs_mut(&mut node.args) {
            let (it, p) = el.into_tuple();
            v.visit_generic_argument_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
        tokens_helper(v, &mut node.gt_token.spans);
    }
    #[cfg(feature = "full")]
    pub fn visit_arm_mut<V>(v: &mut V, node: &mut Arm)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_pat_mut(&mut node.pat);
        if let Some(it) = &mut node.guard {
            tokens_helper(v, &mut (it).0.span);
            v.visit_expr_mut(&mut *(it).1);
        }
        tokens_helper(v, &mut node.fat_arrow_token.spans);
        v.visit_expr_mut(&mut *node.body);
        if let Some(it) = &mut node.comma {
            tokens_helper(v, &mut it.spans);
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_attr_style_mut<V>(v: &mut V, node: &mut AttrStyle)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            AttrStyle::Outer => {}
            AttrStyle::Inner(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_attribute_mut<V>(v: &mut V, node: &mut Attribute)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.pound_token.spans);
        v.visit_attr_style_mut(&mut node.style);
        tokens_helper(v, &mut node.bracket_token.span);
        v.visit_path_mut(&mut node.path);
        skip!(node.tokens);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_bare_fn_arg_mut<V>(v: &mut V, node: &mut BareFnArg)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        if let Some(it) = &mut node.name {
            v.visit_ident_mut(&mut (it).0);
            tokens_helper(v, &mut (it).1.spans);
        }
        v.visit_type_mut(&mut node.ty);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_bin_op_mut<V>(v: &mut V, node: &mut BinOp)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            BinOp::Add(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::Sub(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::Mul(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::Div(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::Rem(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::And(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::Or(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::BitXor(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::BitAnd(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::BitOr(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::Shl(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::Shr(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::Eq(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::Lt(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::Le(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::Ne(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::Ge(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::Gt(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::AddEq(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::SubEq(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::MulEq(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::DivEq(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::RemEq(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::BitXorEq(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::BitAndEq(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::BitOrEq(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::ShlEq(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            BinOp::ShrEq(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_binding_mut<V>(v: &mut V, node: &mut Binding)
    where
        V: VisitMut + ?Sized,
    {
        v.visit_ident_mut(&mut node.ident);
        tokens_helper(v, &mut node.eq_token.spans);
        v.visit_type_mut(&mut node.ty);
    }
    #[cfg(feature = "full")]
    pub fn visit_block_mut<V>(v: &mut V, node: &mut Block)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.brace_token.span);
        for it in &mut node.stmts {
            v.visit_stmt_mut(it);
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_bound_lifetimes_mut<V>(v: &mut V, node: &mut BoundLifetimes)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.for_token.span);
        tokens_helper(v, &mut node.lt_token.spans);
        for el in Punctuated::pairs_mut(&mut node.lifetimes) {
            let (it, p) = el.into_tuple();
            v.visit_lifetime_def_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
        tokens_helper(v, &mut node.gt_token.spans);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_const_param_mut<V>(v: &mut V, node: &mut ConstParam)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.const_token.span);
        v.visit_ident_mut(&mut node.ident);
        tokens_helper(v, &mut node.colon_token.spans);
        v.visit_type_mut(&mut node.ty);
        if let Some(it) = &mut node.eq_token {
            tokens_helper(v, &mut it.spans);
        }
        if let Some(it) = &mut node.default {
            v.visit_expr_mut(it);
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_constraint_mut<V>(v: &mut V, node: &mut Constraint)
    where
        V: VisitMut + ?Sized,
    {
        v.visit_ident_mut(&mut node.ident);
        tokens_helper(v, &mut node.colon_token.spans);
        for el in Punctuated::pairs_mut(&mut node.bounds) {
            let (it, p) = el.into_tuple();
            v.visit_type_param_bound_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(feature = "derive")]
    pub fn visit_data_mut<V>(v: &mut V, node: &mut Data)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            Data::Struct(_binding_0) => {
                v.visit_data_struct_mut(_binding_0);
            }
            Data::Enum(_binding_0) => {
                v.visit_data_enum_mut(_binding_0);
            }
            Data::Union(_binding_0) => {
                v.visit_data_union_mut(_binding_0);
            }
        }
    }
    #[cfg(feature = "derive")]
    pub fn visit_data_enum_mut<V>(v: &mut V, node: &mut DataEnum)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.enum_token.span);
        tokens_helper(v, &mut node.brace_token.span);
        for el in Punctuated::pairs_mut(&mut node.variants) {
            let (it, p) = el.into_tuple();
            v.visit_variant_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(feature = "derive")]
    pub fn visit_data_struct_mut<V>(v: &mut V, node: &mut DataStruct)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.struct_token.span);
        v.visit_fields_mut(&mut node.fields);
        if let Some(it) = &mut node.semi_token {
            tokens_helper(v, &mut it.spans);
        }
    }
    #[cfg(feature = "derive")]
    pub fn visit_data_union_mut<V>(v: &mut V, node: &mut DataUnion)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.union_token.span);
        v.visit_fields_named_mut(&mut node.fields);
    }
    #[cfg(feature = "derive")]
    pub fn visit_derive_input_mut<V>(v: &mut V, node: &mut DeriveInput)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        v.visit_ident_mut(&mut node.ident);
        v.visit_generics_mut(&mut node.generics);
        v.visit_data_mut(&mut node.data);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_expr_mut<V>(v: &mut V, node: &mut Expr)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            Expr::Array(_binding_0) => {
                full!(v.visit_expr_array_mut(_binding_0));
            }
            Expr::Assign(_binding_0) => {
                full!(v.visit_expr_assign_mut(_binding_0));
            }
            Expr::AssignOp(_binding_0) => {
                full!(v.visit_expr_assign_op_mut(_binding_0));
            }
            Expr::Async(_binding_0) => {
                full!(v.visit_expr_async_mut(_binding_0));
            }
            Expr::Await(_binding_0) => {
                full!(v.visit_expr_await_mut(_binding_0));
            }
            Expr::Binary(_binding_0) => {
                v.visit_expr_binary_mut(_binding_0);
            }
            Expr::Block(_binding_0) => {
                full!(v.visit_expr_block_mut(_binding_0));
            }
            Expr::Box(_binding_0) => {
                full!(v.visit_expr_box_mut(_binding_0));
            }
            Expr::Break(_binding_0) => {
                full!(v.visit_expr_break_mut(_binding_0));
            }
            Expr::Call(_binding_0) => {
                v.visit_expr_call_mut(_binding_0);
            }
            Expr::Cast(_binding_0) => {
                v.visit_expr_cast_mut(_binding_0);
            }
            Expr::Closure(_binding_0) => {
                full!(v.visit_expr_closure_mut(_binding_0));
            }
            Expr::Continue(_binding_0) => {
                full!(v.visit_expr_continue_mut(_binding_0));
            }
            Expr::Field(_binding_0) => {
                v.visit_expr_field_mut(_binding_0);
            }
            Expr::ForLoop(_binding_0) => {
                full!(v.visit_expr_for_loop_mut(_binding_0));
            }
            Expr::Group(_binding_0) => {
                full!(v.visit_expr_group_mut(_binding_0));
            }
            Expr::If(_binding_0) => {
                full!(v.visit_expr_if_mut(_binding_0));
            }
            Expr::Index(_binding_0) => {
                v.visit_expr_index_mut(_binding_0);
            }
            Expr::Let(_binding_0) => {
                full!(v.visit_expr_let_mut(_binding_0));
            }
            Expr::Lit(_binding_0) => {
                v.visit_expr_lit_mut(_binding_0);
            }
            Expr::Loop(_binding_0) => {
                full!(v.visit_expr_loop_mut(_binding_0));
            }
            Expr::Macro(_binding_0) => {
                full!(v.visit_expr_macro_mut(_binding_0));
            }
            Expr::Match(_binding_0) => {
                full!(v.visit_expr_match_mut(_binding_0));
            }
            Expr::MethodCall(_binding_0) => {
                full!(v.visit_expr_method_call_mut(_binding_0));
            }
            Expr::Paren(_binding_0) => {
                v.visit_expr_paren_mut(_binding_0);
            }
            Expr::Path(_binding_0) => {
                v.visit_expr_path_mut(_binding_0);
            }
            Expr::Range(_binding_0) => {
                full!(v.visit_expr_range_mut(_binding_0));
            }
            Expr::Reference(_binding_0) => {
                full!(v.visit_expr_reference_mut(_binding_0));
            }
            Expr::Repeat(_binding_0) => {
                full!(v.visit_expr_repeat_mut(_binding_0));
            }
            Expr::Return(_binding_0) => {
                full!(v.visit_expr_return_mut(_binding_0));
            }
            Expr::Struct(_binding_0) => {
                full!(v.visit_expr_struct_mut(_binding_0));
            }
            Expr::Try(_binding_0) => {
                full!(v.visit_expr_try_mut(_binding_0));
            }
            Expr::TryBlock(_binding_0) => {
                full!(v.visit_expr_try_block_mut(_binding_0));
            }
            Expr::Tuple(_binding_0) => {
                full!(v.visit_expr_tuple_mut(_binding_0));
            }
            Expr::Type(_binding_0) => {
                full!(v.visit_expr_type_mut(_binding_0));
            }
            Expr::Unary(_binding_0) => {
                v.visit_expr_unary_mut(_binding_0);
            }
            Expr::Unsafe(_binding_0) => {
                full!(v.visit_expr_unsafe_mut(_binding_0));
            }
            Expr::Verbatim(_binding_0) => {
                skip!(_binding_0);
            }
            Expr::While(_binding_0) => {
                full!(v.visit_expr_while_mut(_binding_0));
            }
            Expr::Yield(_binding_0) => {
                full!(v.visit_expr_yield_mut(_binding_0));
            }
            #[cfg(syn_no_non_exhaustive)]
            _ => unreachable!(),
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_array_mut<V>(v: &mut V, node: &mut ExprArray)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.bracket_token.span);
        for el in Punctuated::pairs_mut(&mut node.elems) {
            let (it, p) = el.into_tuple();
            v.visit_expr_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_assign_mut<V>(v: &mut V, node: &mut ExprAssign)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_expr_mut(&mut *node.left);
        tokens_helper(v, &mut node.eq_token.spans);
        v.visit_expr_mut(&mut *node.right);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_assign_op_mut<V>(v: &mut V, node: &mut ExprAssignOp)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_expr_mut(&mut *node.left);
        v.visit_bin_op_mut(&mut node.op);
        v.visit_expr_mut(&mut *node.right);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_async_mut<V>(v: &mut V, node: &mut ExprAsync)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.async_token.span);
        if let Some(it) = &mut node.capture {
            tokens_helper(v, &mut it.span);
        }
        v.visit_block_mut(&mut node.block);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_await_mut<V>(v: &mut V, node: &mut ExprAwait)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_expr_mut(&mut *node.base);
        tokens_helper(v, &mut node.dot_token.spans);
        tokens_helper(v, &mut node.await_token.span);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_expr_binary_mut<V>(v: &mut V, node: &mut ExprBinary)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_expr_mut(&mut *node.left);
        v.visit_bin_op_mut(&mut node.op);
        v.visit_expr_mut(&mut *node.right);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_block_mut<V>(v: &mut V, node: &mut ExprBlock)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        if let Some(it) = &mut node.label {
            v.visit_label_mut(it);
        }
        v.visit_block_mut(&mut node.block);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_box_mut<V>(v: &mut V, node: &mut ExprBox)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.box_token.span);
        v.visit_expr_mut(&mut *node.expr);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_break_mut<V>(v: &mut V, node: &mut ExprBreak)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.break_token.span);
        if let Some(it) = &mut node.label {
            v.visit_lifetime_mut(it);
        }
        if let Some(it) = &mut node.expr {
            v.visit_expr_mut(&mut **it);
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_expr_call_mut<V>(v: &mut V, node: &mut ExprCall)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_expr_mut(&mut *node.func);
        tokens_helper(v, &mut node.paren_token.span);
        for el in Punctuated::pairs_mut(&mut node.args) {
            let (it, p) = el.into_tuple();
            v.visit_expr_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_expr_cast_mut<V>(v: &mut V, node: &mut ExprCast)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_expr_mut(&mut *node.expr);
        tokens_helper(v, &mut node.as_token.span);
        v.visit_type_mut(&mut *node.ty);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_closure_mut<V>(v: &mut V, node: &mut ExprClosure)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        if let Some(it) = &mut node.movability {
            tokens_helper(v, &mut it.span);
        }
        if let Some(it) = &mut node.asyncness {
            tokens_helper(v, &mut it.span);
        }
        if let Some(it) = &mut node.capture {
            tokens_helper(v, &mut it.span);
        }
        tokens_helper(v, &mut node.or1_token.spans);
        for el in Punctuated::pairs_mut(&mut node.inputs) {
            let (it, p) = el.into_tuple();
            v.visit_pat_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
        tokens_helper(v, &mut node.or2_token.spans);
        v.visit_return_type_mut(&mut node.output);
        v.visit_expr_mut(&mut *node.body);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_continue_mut<V>(v: &mut V, node: &mut ExprContinue)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.continue_token.span);
        if let Some(it) = &mut node.label {
            v.visit_lifetime_mut(it);
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_expr_field_mut<V>(v: &mut V, node: &mut ExprField)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_expr_mut(&mut *node.base);
        tokens_helper(v, &mut node.dot_token.spans);
        v.visit_member_mut(&mut node.member);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_for_loop_mut<V>(v: &mut V, node: &mut ExprForLoop)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        if let Some(it) = &mut node.label {
            v.visit_label_mut(it);
        }
        tokens_helper(v, &mut node.for_token.span);
        v.visit_pat_mut(&mut node.pat);
        tokens_helper(v, &mut node.in_token.span);
        v.visit_expr_mut(&mut *node.expr);
        v.visit_block_mut(&mut node.body);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_group_mut<V>(v: &mut V, node: &mut ExprGroup)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.group_token.span);
        v.visit_expr_mut(&mut *node.expr);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_if_mut<V>(v: &mut V, node: &mut ExprIf)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.if_token.span);
        v.visit_expr_mut(&mut *node.cond);
        v.visit_block_mut(&mut node.then_branch);
        if let Some(it) = &mut node.else_branch {
            tokens_helper(v, &mut (it).0.span);
            v.visit_expr_mut(&mut *(it).1);
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_expr_index_mut<V>(v: &mut V, node: &mut ExprIndex)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_expr_mut(&mut *node.expr);
        tokens_helper(v, &mut node.bracket_token.span);
        v.visit_expr_mut(&mut *node.index);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_let_mut<V>(v: &mut V, node: &mut ExprLet)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.let_token.span);
        v.visit_pat_mut(&mut node.pat);
        tokens_helper(v, &mut node.eq_token.spans);
        v.visit_expr_mut(&mut *node.expr);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_expr_lit_mut<V>(v: &mut V, node: &mut ExprLit)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_lit_mut(&mut node.lit);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_loop_mut<V>(v: &mut V, node: &mut ExprLoop)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        if let Some(it) = &mut node.label {
            v.visit_label_mut(it);
        }
        tokens_helper(v, &mut node.loop_token.span);
        v.visit_block_mut(&mut node.body);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_macro_mut<V>(v: &mut V, node: &mut ExprMacro)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_macro_mut(&mut node.mac);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_match_mut<V>(v: &mut V, node: &mut ExprMatch)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.match_token.span);
        v.visit_expr_mut(&mut *node.expr);
        tokens_helper(v, &mut node.brace_token.span);
        for it in &mut node.arms {
            v.visit_arm_mut(it);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_method_call_mut<V>(v: &mut V, node: &mut ExprMethodCall)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_expr_mut(&mut *node.receiver);
        tokens_helper(v, &mut node.dot_token.spans);
        v.visit_ident_mut(&mut node.method);
        if let Some(it) = &mut node.turbofish {
            v.visit_method_turbofish_mut(it);
        }
        tokens_helper(v, &mut node.paren_token.span);
        for el in Punctuated::pairs_mut(&mut node.args) {
            let (it, p) = el.into_tuple();
            v.visit_expr_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_expr_paren_mut<V>(v: &mut V, node: &mut ExprParen)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.paren_token.span);
        v.visit_expr_mut(&mut *node.expr);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_expr_path_mut<V>(v: &mut V, node: &mut ExprPath)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        if let Some(it) = &mut node.qself {
            v.visit_qself_mut(it);
        }
        v.visit_path_mut(&mut node.path);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_range_mut<V>(v: &mut V, node: &mut ExprRange)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        if let Some(it) = &mut node.from {
            v.visit_expr_mut(&mut **it);
        }
        v.visit_range_limits_mut(&mut node.limits);
        if let Some(it) = &mut node.to {
            v.visit_expr_mut(&mut **it);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_reference_mut<V>(v: &mut V, node: &mut ExprReference)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.and_token.spans);
        if let Some(it) = &mut node.mutability {
            tokens_helper(v, &mut it.span);
        }
        v.visit_expr_mut(&mut *node.expr);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_repeat_mut<V>(v: &mut V, node: &mut ExprRepeat)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.bracket_token.span);
        v.visit_expr_mut(&mut *node.expr);
        tokens_helper(v, &mut node.semi_token.spans);
        v.visit_expr_mut(&mut *node.len);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_return_mut<V>(v: &mut V, node: &mut ExprReturn)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.return_token.span);
        if let Some(it) = &mut node.expr {
            v.visit_expr_mut(&mut **it);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_struct_mut<V>(v: &mut V, node: &mut ExprStruct)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_path_mut(&mut node.path);
        tokens_helper(v, &mut node.brace_token.span);
        for el in Punctuated::pairs_mut(&mut node.fields) {
            let (it, p) = el.into_tuple();
            v.visit_field_value_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
        if let Some(it) = &mut node.dot2_token {
            tokens_helper(v, &mut it.spans);
        }
        if let Some(it) = &mut node.rest {
            v.visit_expr_mut(&mut **it);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_try_mut<V>(v: &mut V, node: &mut ExprTry)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_expr_mut(&mut *node.expr);
        tokens_helper(v, &mut node.question_token.spans);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_try_block_mut<V>(v: &mut V, node: &mut ExprTryBlock)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.try_token.span);
        v.visit_block_mut(&mut node.block);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_tuple_mut<V>(v: &mut V, node: &mut ExprTuple)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.paren_token.span);
        for el in Punctuated::pairs_mut(&mut node.elems) {
            let (it, p) = el.into_tuple();
            v.visit_expr_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_type_mut<V>(v: &mut V, node: &mut ExprType)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_expr_mut(&mut *node.expr);
        tokens_helper(v, &mut node.colon_token.spans);
        v.visit_type_mut(&mut *node.ty);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_expr_unary_mut<V>(v: &mut V, node: &mut ExprUnary)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_un_op_mut(&mut node.op);
        v.visit_expr_mut(&mut *node.expr);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_unsafe_mut<V>(v: &mut V, node: &mut ExprUnsafe)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.unsafe_token.span);
        v.visit_block_mut(&mut node.block);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_while_mut<V>(v: &mut V, node: &mut ExprWhile)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        if let Some(it) = &mut node.label {
            v.visit_label_mut(it);
        }
        tokens_helper(v, &mut node.while_token.span);
        v.visit_expr_mut(&mut *node.cond);
        v.visit_block_mut(&mut node.body);
    }
    #[cfg(feature = "full")]
    pub fn visit_expr_yield_mut<V>(v: &mut V, node: &mut ExprYield)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.yield_token.span);
        if let Some(it) = &mut node.expr {
            v.visit_expr_mut(&mut **it);
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_field_mut<V>(v: &mut V, node: &mut Field)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        if let Some(it) = &mut node.ident {
            v.visit_ident_mut(it);
        }
        if let Some(it) = &mut node.colon_token {
            tokens_helper(v, &mut it.spans);
        }
        v.visit_type_mut(&mut node.ty);
    }
    #[cfg(feature = "full")]
    pub fn visit_field_pat_mut<V>(v: &mut V, node: &mut FieldPat)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_member_mut(&mut node.member);
        if let Some(it) = &mut node.colon_token {
            tokens_helper(v, &mut it.spans);
        }
        v.visit_pat_mut(&mut *node.pat);
    }
    #[cfg(feature = "full")]
    pub fn visit_field_value_mut<V>(v: &mut V, node: &mut FieldValue)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_member_mut(&mut node.member);
        if let Some(it) = &mut node.colon_token {
            tokens_helper(v, &mut it.spans);
        }
        v.visit_expr_mut(&mut node.expr);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_fields_mut<V>(v: &mut V, node: &mut Fields)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            Fields::Named(_binding_0) => {
                v.visit_fields_named_mut(_binding_0);
            }
            Fields::Unnamed(_binding_0) => {
                v.visit_fields_unnamed_mut(_binding_0);
            }
            Fields::Unit => {}
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_fields_named_mut<V>(v: &mut V, node: &mut FieldsNamed)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.brace_token.span);
        for el in Punctuated::pairs_mut(&mut node.named) {
            let (it, p) = el.into_tuple();
            v.visit_field_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_fields_unnamed_mut<V>(v: &mut V, node: &mut FieldsUnnamed)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.paren_token.span);
        for el in Punctuated::pairs_mut(&mut node.unnamed) {
            let (it, p) = el.into_tuple();
            v.visit_field_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_file_mut<V>(v: &mut V, node: &mut File)
    where
        V: VisitMut + ?Sized,
    {
        skip!(node.shebang);
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        for it in &mut node.items {
            v.visit_item_mut(it);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_fn_arg_mut<V>(v: &mut V, node: &mut FnArg)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            FnArg::Receiver(_binding_0) => {
                v.visit_receiver_mut(_binding_0);
            }
            FnArg::Typed(_binding_0) => {
                v.visit_pat_type_mut(_binding_0);
            }
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_foreign_item_mut<V>(v: &mut V, node: &mut ForeignItem)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            ForeignItem::Fn(_binding_0) => {
                v.visit_foreign_item_fn_mut(_binding_0);
            }
            ForeignItem::Static(_binding_0) => {
                v.visit_foreign_item_static_mut(_binding_0);
            }
            ForeignItem::Type(_binding_0) => {
                v.visit_foreign_item_type_mut(_binding_0);
            }
            ForeignItem::Macro(_binding_0) => {
                v.visit_foreign_item_macro_mut(_binding_0);
            }
            ForeignItem::Verbatim(_binding_0) => {
                skip!(_binding_0);
            }
            #[cfg(syn_no_non_exhaustive)]
            _ => unreachable!(),
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_foreign_item_fn_mut<V>(v: &mut V, node: &mut ForeignItemFn)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        v.visit_signature_mut(&mut node.sig);
        tokens_helper(v, &mut node.semi_token.spans);
    }
    #[cfg(feature = "full")]
    pub fn visit_foreign_item_macro_mut<V>(v: &mut V, node: &mut ForeignItemMacro)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_macro_mut(&mut node.mac);
        if let Some(it) = &mut node.semi_token {
            tokens_helper(v, &mut it.spans);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_foreign_item_static_mut<V>(v: &mut V, node: &mut ForeignItemStatic)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        tokens_helper(v, &mut node.static_token.span);
        if let Some(it) = &mut node.mutability {
            tokens_helper(v, &mut it.span);
        }
        v.visit_ident_mut(&mut node.ident);
        tokens_helper(v, &mut node.colon_token.spans);
        v.visit_type_mut(&mut *node.ty);
        tokens_helper(v, &mut node.semi_token.spans);
    }
    #[cfg(feature = "full")]
    pub fn visit_foreign_item_type_mut<V>(v: &mut V, node: &mut ForeignItemType)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        tokens_helper(v, &mut node.type_token.span);
        v.visit_ident_mut(&mut node.ident);
        tokens_helper(v, &mut node.semi_token.spans);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_generic_argument_mut<V>(v: &mut V, node: &mut GenericArgument)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            GenericArgument::Lifetime(_binding_0) => {
                v.visit_lifetime_mut(_binding_0);
            }
            GenericArgument::Type(_binding_0) => {
                v.visit_type_mut(_binding_0);
            }
            GenericArgument::Const(_binding_0) => {
                v.visit_expr_mut(_binding_0);
            }
            GenericArgument::Binding(_binding_0) => {
                v.visit_binding_mut(_binding_0);
            }
            GenericArgument::Constraint(_binding_0) => {
                v.visit_constraint_mut(_binding_0);
            }
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_generic_method_argument_mut<V>(v: &mut V, node: &mut GenericMethodArgument)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            GenericMethodArgument::Type(_binding_0) => {
                v.visit_type_mut(_binding_0);
            }
            GenericMethodArgument::Const(_binding_0) => {
                v.visit_expr_mut(_binding_0);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_generic_param_mut<V>(v: &mut V, node: &mut GenericParam)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            GenericParam::Type(_binding_0) => {
                v.visit_type_param_mut(_binding_0);
            }
            GenericParam::Lifetime(_binding_0) => {
                v.visit_lifetime_def_mut(_binding_0);
            }
            GenericParam::Const(_binding_0) => {
                v.visit_const_param_mut(_binding_0);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_generics_mut<V>(v: &mut V, node: &mut Generics)
    where
        V: VisitMut + ?Sized,
    {
        if let Some(it) = &mut node.lt_token {
            tokens_helper(v, &mut it.spans);
        }
        for el in Punctuated::pairs_mut(&mut node.params) {
            let (it, p) = el.into_tuple();
            v.visit_generic_param_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
        if let Some(it) = &mut node.gt_token {
            tokens_helper(v, &mut it.spans);
        }
        if let Some(it) = &mut node.where_clause {
            v.visit_where_clause_mut(it);
        }
    }
    pub fn visit_ident_mut<V>(v: &mut V, node: &mut Ident)
    where
        V: VisitMut + ?Sized,
    {
        let mut span = node.span();
        v.visit_span_mut(&mut span);
        node.set_span(span);
    }
    #[cfg(feature = "full")]
    pub fn visit_impl_item_mut<V>(v: &mut V, node: &mut ImplItem)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            ImplItem::Const(_binding_0) => {
                v.visit_impl_item_const_mut(_binding_0);
            }
            ImplItem::Method(_binding_0) => {
                v.visit_impl_item_method_mut(_binding_0);
            }
            ImplItem::Type(_binding_0) => {
                v.visit_impl_item_type_mut(_binding_0);
            }
            ImplItem::Macro(_binding_0) => {
                v.visit_impl_item_macro_mut(_binding_0);
            }
            ImplItem::Verbatim(_binding_0) => {
                skip!(_binding_0);
            }
            #[cfg(syn_no_non_exhaustive)]
            _ => unreachable!(),
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_impl_item_const_mut<V>(v: &mut V, node: &mut ImplItemConst)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        if let Some(it) = &mut node.defaultness {
            tokens_helper(v, &mut it.span);
        }
        tokens_helper(v, &mut node.const_token.span);
        v.visit_ident_mut(&mut node.ident);
        tokens_helper(v, &mut node.colon_token.spans);
        v.visit_type_mut(&mut node.ty);
        tokens_helper(v, &mut node.eq_token.spans);
        v.visit_expr_mut(&mut node.expr);
        tokens_helper(v, &mut node.semi_token.spans);
    }
    #[cfg(feature = "full")]
    pub fn visit_impl_item_macro_mut<V>(v: &mut V, node: &mut ImplItemMacro)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_macro_mut(&mut node.mac);
        if let Some(it) = &mut node.semi_token {
            tokens_helper(v, &mut it.spans);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_impl_item_method_mut<V>(v: &mut V, node: &mut ImplItemMethod)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        if let Some(it) = &mut node.defaultness {
            tokens_helper(v, &mut it.span);
        }
        v.visit_signature_mut(&mut node.sig);
        v.visit_block_mut(&mut node.block);
    }
    #[cfg(feature = "full")]
    pub fn visit_impl_item_type_mut<V>(v: &mut V, node: &mut ImplItemType)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        if let Some(it) = &mut node.defaultness {
            tokens_helper(v, &mut it.span);
        }
        tokens_helper(v, &mut node.type_token.span);
        v.visit_ident_mut(&mut node.ident);
        v.visit_generics_mut(&mut node.generics);
        tokens_helper(v, &mut node.eq_token.spans);
        v.visit_type_mut(&mut node.ty);
        tokens_helper(v, &mut node.semi_token.spans);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_index_mut<V>(v: &mut V, node: &mut Index)
    where
        V: VisitMut + ?Sized,
    {
        skip!(node.index);
        v.visit_span_mut(&mut node.span);
    }
    #[cfg(feature = "full")]
    pub fn visit_item_mut<V>(v: &mut V, node: &mut Item)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            Item::Const(_binding_0) => {
                v.visit_item_const_mut(_binding_0);
            }
            Item::Enum(_binding_0) => {
                v.visit_item_enum_mut(_binding_0);
            }
            Item::ExternCrate(_binding_0) => {
                v.visit_item_extern_crate_mut(_binding_0);
            }
            Item::Fn(_binding_0) => {
                v.visit_item_fn_mut(_binding_0);
            }
            Item::ForeignMod(_binding_0) => {
                v.visit_item_foreign_mod_mut(_binding_0);
            }
            Item::Impl(_binding_0) => {
                v.visit_item_impl_mut(_binding_0);
            }
            Item::Macro(_binding_0) => {
                v.visit_item_macro_mut(_binding_0);
            }
            Item::Macro2(_binding_0) => {
                v.visit_item_macro2_mut(_binding_0);
            }
            Item::Mod(_binding_0) => {
                v.visit_item_mod_mut(_binding_0);
            }
            Item::Static(_binding_0) => {
                v.visit_item_static_mut(_binding_0);
            }
            Item::Struct(_binding_0) => {
                v.visit_item_struct_mut(_binding_0);
            }
            Item::Trait(_binding_0) => {
                v.visit_item_trait_mut(_binding_0);
            }
            Item::TraitAlias(_binding_0) => {
                v.visit_item_trait_alias_mut(_binding_0);
            }
            Item::Type(_binding_0) => {
                v.visit_item_type_mut(_binding_0);
            }
            Item::Union(_binding_0) => {
                v.visit_item_union_mut(_binding_0);
            }
            Item::Use(_binding_0) => {
                v.visit_item_use_mut(_binding_0);
            }
            Item::Verbatim(_binding_0) => {
                skip!(_binding_0);
            }
            #[cfg(syn_no_non_exhaustive)]
            _ => unreachable!(),
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_item_const_mut<V>(v: &mut V, node: &mut ItemConst)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        tokens_helper(v, &mut node.const_token.span);
        v.visit_ident_mut(&mut node.ident);
        tokens_helper(v, &mut node.colon_token.spans);
        v.visit_type_mut(&mut *node.ty);
        tokens_helper(v, &mut node.eq_token.spans);
        v.visit_expr_mut(&mut *node.expr);
        tokens_helper(v, &mut node.semi_token.spans);
    }
    #[cfg(feature = "full")]
    pub fn visit_item_enum_mut<V>(v: &mut V, node: &mut ItemEnum)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        tokens_helper(v, &mut node.enum_token.span);
        v.visit_ident_mut(&mut node.ident);
        v.visit_generics_mut(&mut node.generics);
        tokens_helper(v, &mut node.brace_token.span);
        for el in Punctuated::pairs_mut(&mut node.variants) {
            let (it, p) = el.into_tuple();
            v.visit_variant_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_item_extern_crate_mut<V>(v: &mut V, node: &mut ItemExternCrate)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        tokens_helper(v, &mut node.extern_token.span);
        tokens_helper(v, &mut node.crate_token.span);
        v.visit_ident_mut(&mut node.ident);
        if let Some(it) = &mut node.rename {
            tokens_helper(v, &mut (it).0.span);
            v.visit_ident_mut(&mut (it).1);
        }
        tokens_helper(v, &mut node.semi_token.spans);
    }
    #[cfg(feature = "full")]
    pub fn visit_item_fn_mut<V>(v: &mut V, node: &mut ItemFn)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        v.visit_signature_mut(&mut node.sig);
        v.visit_block_mut(&mut *node.block);
    }
    #[cfg(feature = "full")]
    pub fn visit_item_foreign_mod_mut<V>(v: &mut V, node: &mut ItemForeignMod)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_abi_mut(&mut node.abi);
        tokens_helper(v, &mut node.brace_token.span);
        for it in &mut node.items {
            v.visit_foreign_item_mut(it);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_item_impl_mut<V>(v: &mut V, node: &mut ItemImpl)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        if let Some(it) = &mut node.defaultness {
            tokens_helper(v, &mut it.span);
        }
        if let Some(it) = &mut node.unsafety {
            tokens_helper(v, &mut it.span);
        }
        tokens_helper(v, &mut node.impl_token.span);
        v.visit_generics_mut(&mut node.generics);
        if let Some(it) = &mut node.trait_ {
            if let Some(it) = &mut (it).0 {
                tokens_helper(v, &mut it.spans);
            }
            v.visit_path_mut(&mut (it).1);
            tokens_helper(v, &mut (it).2.span);
        }
        v.visit_type_mut(&mut *node.self_ty);
        tokens_helper(v, &mut node.brace_token.span);
        for it in &mut node.items {
            v.visit_impl_item_mut(it);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_item_macro_mut<V>(v: &mut V, node: &mut ItemMacro)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        if let Some(it) = &mut node.ident {
            v.visit_ident_mut(it);
        }
        v.visit_macro_mut(&mut node.mac);
        if let Some(it) = &mut node.semi_token {
            tokens_helper(v, &mut it.spans);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_item_macro2_mut<V>(v: &mut V, node: &mut ItemMacro2)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        tokens_helper(v, &mut node.macro_token.span);
        v.visit_ident_mut(&mut node.ident);
        skip!(node.rules);
    }
    #[cfg(feature = "full")]
    pub fn visit_item_mod_mut<V>(v: &mut V, node: &mut ItemMod)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        tokens_helper(v, &mut node.mod_token.span);
        v.visit_ident_mut(&mut node.ident);
        if let Some(it) = &mut node.content {
            tokens_helper(v, &mut (it).0.span);
            for it in &mut (it).1 {
                v.visit_item_mut(it);
            }
        }
        if let Some(it) = &mut node.semi {
            tokens_helper(v, &mut it.spans);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_item_static_mut<V>(v: &mut V, node: &mut ItemStatic)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        tokens_helper(v, &mut node.static_token.span);
        if let Some(it) = &mut node.mutability {
            tokens_helper(v, &mut it.span);
        }
        v.visit_ident_mut(&mut node.ident);
        tokens_helper(v, &mut node.colon_token.spans);
        v.visit_type_mut(&mut *node.ty);
        tokens_helper(v, &mut node.eq_token.spans);
        v.visit_expr_mut(&mut *node.expr);
        tokens_helper(v, &mut node.semi_token.spans);
    }
    #[cfg(feature = "full")]
    pub fn visit_item_struct_mut<V>(v: &mut V, node: &mut ItemStruct)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        tokens_helper(v, &mut node.struct_token.span);
        v.visit_ident_mut(&mut node.ident);
        v.visit_generics_mut(&mut node.generics);
        v.visit_fields_mut(&mut node.fields);
        if let Some(it) = &mut node.semi_token {
            tokens_helper(v, &mut it.spans);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_item_trait_mut<V>(v: &mut V, node: &mut ItemTrait)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        if let Some(it) = &mut node.unsafety {
            tokens_helper(v, &mut it.span);
        }
        if let Some(it) = &mut node.auto_token {
            tokens_helper(v, &mut it.span);
        }
        tokens_helper(v, &mut node.trait_token.span);
        v.visit_ident_mut(&mut node.ident);
        v.visit_generics_mut(&mut node.generics);
        if let Some(it) = &mut node.colon_token {
            tokens_helper(v, &mut it.spans);
        }
        for el in Punctuated::pairs_mut(&mut node.supertraits) {
            let (it, p) = el.into_tuple();
            v.visit_type_param_bound_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
        tokens_helper(v, &mut node.brace_token.span);
        for it in &mut node.items {
            v.visit_trait_item_mut(it);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_item_trait_alias_mut<V>(v: &mut V, node: &mut ItemTraitAlias)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        tokens_helper(v, &mut node.trait_token.span);
        v.visit_ident_mut(&mut node.ident);
        v.visit_generics_mut(&mut node.generics);
        tokens_helper(v, &mut node.eq_token.spans);
        for el in Punctuated::pairs_mut(&mut node.bounds) {
            let (it, p) = el.into_tuple();
            v.visit_type_param_bound_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
        tokens_helper(v, &mut node.semi_token.spans);
    }
    #[cfg(feature = "full")]
    pub fn visit_item_type_mut<V>(v: &mut V, node: &mut ItemType)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        tokens_helper(v, &mut node.type_token.span);
        v.visit_ident_mut(&mut node.ident);
        v.visit_generics_mut(&mut node.generics);
        tokens_helper(v, &mut node.eq_token.spans);
        v.visit_type_mut(&mut *node.ty);
        tokens_helper(v, &mut node.semi_token.spans);
    }
    #[cfg(feature = "full")]
    pub fn visit_item_union_mut<V>(v: &mut V, node: &mut ItemUnion)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        tokens_helper(v, &mut node.union_token.span);
        v.visit_ident_mut(&mut node.ident);
        v.visit_generics_mut(&mut node.generics);
        v.visit_fields_named_mut(&mut node.fields);
    }
    #[cfg(feature = "full")]
    pub fn visit_item_use_mut<V>(v: &mut V, node: &mut ItemUse)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_visibility_mut(&mut node.vis);
        tokens_helper(v, &mut node.use_token.span);
        if let Some(it) = &mut node.leading_colon {
            tokens_helper(v, &mut it.spans);
        }
        v.visit_use_tree_mut(&mut node.tree);
        tokens_helper(v, &mut node.semi_token.spans);
    }
    #[cfg(feature = "full")]
    pub fn visit_label_mut<V>(v: &mut V, node: &mut Label)
    where
        V: VisitMut + ?Sized,
    {
        v.visit_lifetime_mut(&mut node.name);
        tokens_helper(v, &mut node.colon_token.spans);
    }
    pub fn visit_lifetime_mut<V>(v: &mut V, node: &mut Lifetime)
    where
        V: VisitMut + ?Sized,
    {
        v.visit_span_mut(&mut node.apostrophe);
        v.visit_ident_mut(&mut node.ident);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_lifetime_def_mut<V>(v: &mut V, node: &mut LifetimeDef)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_lifetime_mut(&mut node.lifetime);
        if let Some(it) = &mut node.colon_token {
            tokens_helper(v, &mut it.spans);
        }
        for el in Punctuated::pairs_mut(&mut node.bounds) {
            let (it, p) = el.into_tuple();
            v.visit_lifetime_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    pub fn visit_lit_mut<V>(v: &mut V, node: &mut Lit)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            Lit::Str(_binding_0) => {
                v.visit_lit_str_mut(_binding_0);
            }
            Lit::ByteStr(_binding_0) => {
                v.visit_lit_byte_str_mut(_binding_0);
            }
            Lit::Byte(_binding_0) => {
                v.visit_lit_byte_mut(_binding_0);
            }
            Lit::Char(_binding_0) => {
                v.visit_lit_char_mut(_binding_0);
            }
            Lit::Int(_binding_0) => {
                v.visit_lit_int_mut(_binding_0);
            }
            Lit::Float(_binding_0) => {
                v.visit_lit_float_mut(_binding_0);
            }
            Lit::Bool(_binding_0) => {
                v.visit_lit_bool_mut(_binding_0);
            }
            Lit::Verbatim(_binding_0) => {
                skip!(_binding_0);
            }
        }
    }
    pub fn visit_lit_bool_mut<V>(v: &mut V, node: &mut LitBool)
    where
        V: VisitMut + ?Sized,
    {
        skip!(node.value);
        v.visit_span_mut(&mut node.span);
    }
    pub fn visit_lit_byte_mut<V>(v: &mut V, node: &mut LitByte)
    where
        V: VisitMut + ?Sized,
    {}
    pub fn visit_lit_byte_str_mut<V>(v: &mut V, node: &mut LitByteStr)
    where
        V: VisitMut + ?Sized,
    {}
    pub fn visit_lit_char_mut<V>(v: &mut V, node: &mut LitChar)
    where
        V: VisitMut + ?Sized,
    {}
    pub fn visit_lit_float_mut<V>(v: &mut V, node: &mut LitFloat)
    where
        V: VisitMut + ?Sized,
    {}
    pub fn visit_lit_int_mut<V>(v: &mut V, node: &mut LitInt)
    where
        V: VisitMut + ?Sized,
    {}
    pub fn visit_lit_str_mut<V>(v: &mut V, node: &mut LitStr)
    where
        V: VisitMut + ?Sized,
    {}
    #[cfg(feature = "full")]
    pub fn visit_local_mut<V>(v: &mut V, node: &mut Local)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.let_token.span);
        v.visit_pat_mut(&mut node.pat);
        if let Some(it) = &mut node.init {
            tokens_helper(v, &mut (it).0.spans);
            v.visit_expr_mut(&mut *(it).1);
        }
        tokens_helper(v, &mut node.semi_token.spans);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_macro_mut<V>(v: &mut V, node: &mut Macro)
    where
        V: VisitMut + ?Sized,
    {
        v.visit_path_mut(&mut node.path);
        tokens_helper(v, &mut node.bang_token.spans);
        v.visit_macro_delimiter_mut(&mut node.delimiter);
        skip!(node.tokens);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_macro_delimiter_mut<V>(v: &mut V, node: &mut MacroDelimiter)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            MacroDelimiter::Paren(_binding_0) => {
                tokens_helper(v, &mut _binding_0.span);
            }
            MacroDelimiter::Brace(_binding_0) => {
                tokens_helper(v, &mut _binding_0.span);
            }
            MacroDelimiter::Bracket(_binding_0) => {
                tokens_helper(v, &mut _binding_0.span);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_member_mut<V>(v: &mut V, node: &mut Member)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            Member::Named(_binding_0) => {
                v.visit_ident_mut(_binding_0);
            }
            Member::Unnamed(_binding_0) => {
                v.visit_index_mut(_binding_0);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_meta_mut<V>(v: &mut V, node: &mut Meta)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            Meta::Path(_binding_0) => {
                v.visit_path_mut(_binding_0);
            }
            Meta::List(_binding_0) => {
                v.visit_meta_list_mut(_binding_0);
            }
            Meta::NameValue(_binding_0) => {
                v.visit_meta_name_value_mut(_binding_0);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_meta_list_mut<V>(v: &mut V, node: &mut MetaList)
    where
        V: VisitMut + ?Sized,
    {
        v.visit_path_mut(&mut node.path);
        tokens_helper(v, &mut node.paren_token.span);
        for el in Punctuated::pairs_mut(&mut node.nested) {
            let (it, p) = el.into_tuple();
            v.visit_nested_meta_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_meta_name_value_mut<V>(v: &mut V, node: &mut MetaNameValue)
    where
        V: VisitMut + ?Sized,
    {
        v.visit_path_mut(&mut node.path);
        tokens_helper(v, &mut node.eq_token.spans);
        v.visit_lit_mut(&mut node.lit);
    }
    #[cfg(feature = "full")]
    pub fn visit_method_turbofish_mut<V>(v: &mut V, node: &mut MethodTurbofish)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.colon2_token.spans);
        tokens_helper(v, &mut node.lt_token.spans);
        for el in Punctuated::pairs_mut(&mut node.args) {
            let (it, p) = el.into_tuple();
            v.visit_generic_method_argument_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
        tokens_helper(v, &mut node.gt_token.spans);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_nested_meta_mut<V>(v: &mut V, node: &mut NestedMeta)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            NestedMeta::Meta(_binding_0) => {
                v.visit_meta_mut(_binding_0);
            }
            NestedMeta::Lit(_binding_0) => {
                v.visit_lit_mut(_binding_0);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_parenthesized_generic_arguments_mut<V>(
        v: &mut V,
        node: &mut ParenthesizedGenericArguments,
    )
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.paren_token.span);
        for el in Punctuated::pairs_mut(&mut node.inputs) {
            let (it, p) = el.into_tuple();
            v.visit_type_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
        v.visit_return_type_mut(&mut node.output);
    }
    #[cfg(feature = "full")]
    pub fn visit_pat_mut<V>(v: &mut V, node: &mut Pat)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            Pat::Box(_binding_0) => {
                v.visit_pat_box_mut(_binding_0);
            }
            Pat::Ident(_binding_0) => {
                v.visit_pat_ident_mut(_binding_0);
            }
            Pat::Lit(_binding_0) => {
                v.visit_pat_lit_mut(_binding_0);
            }
            Pat::Macro(_binding_0) => {
                v.visit_pat_macro_mut(_binding_0);
            }
            Pat::Or(_binding_0) => {
                v.visit_pat_or_mut(_binding_0);
            }
            Pat::Path(_binding_0) => {
                v.visit_pat_path_mut(_binding_0);
            }
            Pat::Range(_binding_0) => {
                v.visit_pat_range_mut(_binding_0);
            }
            Pat::Reference(_binding_0) => {
                v.visit_pat_reference_mut(_binding_0);
            }
            Pat::Rest(_binding_0) => {
                v.visit_pat_rest_mut(_binding_0);
            }
            Pat::Slice(_binding_0) => {
                v.visit_pat_slice_mut(_binding_0);
            }
            Pat::Struct(_binding_0) => {
                v.visit_pat_struct_mut(_binding_0);
            }
            Pat::Tuple(_binding_0) => {
                v.visit_pat_tuple_mut(_binding_0);
            }
            Pat::TupleStruct(_binding_0) => {
                v.visit_pat_tuple_struct_mut(_binding_0);
            }
            Pat::Type(_binding_0) => {
                v.visit_pat_type_mut(_binding_0);
            }
            Pat::Verbatim(_binding_0) => {
                skip!(_binding_0);
            }
            Pat::Wild(_binding_0) => {
                v.visit_pat_wild_mut(_binding_0);
            }
            #[cfg(syn_no_non_exhaustive)]
            _ => unreachable!(),
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_pat_box_mut<V>(v: &mut V, node: &mut PatBox)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.box_token.span);
        v.visit_pat_mut(&mut *node.pat);
    }
    #[cfg(feature = "full")]
    pub fn visit_pat_ident_mut<V>(v: &mut V, node: &mut PatIdent)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        if let Some(it) = &mut node.by_ref {
            tokens_helper(v, &mut it.span);
        }
        if let Some(it) = &mut node.mutability {
            tokens_helper(v, &mut it.span);
        }
        v.visit_ident_mut(&mut node.ident);
        if let Some(it) = &mut node.subpat {
            tokens_helper(v, &mut (it).0.spans);
            v.visit_pat_mut(&mut *(it).1);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_pat_lit_mut<V>(v: &mut V, node: &mut PatLit)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_expr_mut(&mut *node.expr);
    }
    #[cfg(feature = "full")]
    pub fn visit_pat_macro_mut<V>(v: &mut V, node: &mut PatMacro)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_macro_mut(&mut node.mac);
    }
    #[cfg(feature = "full")]
    pub fn visit_pat_or_mut<V>(v: &mut V, node: &mut PatOr)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        if let Some(it) = &mut node.leading_vert {
            tokens_helper(v, &mut it.spans);
        }
        for el in Punctuated::pairs_mut(&mut node.cases) {
            let (it, p) = el.into_tuple();
            v.visit_pat_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_pat_path_mut<V>(v: &mut V, node: &mut PatPath)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        if let Some(it) = &mut node.qself {
            v.visit_qself_mut(it);
        }
        v.visit_path_mut(&mut node.path);
    }
    #[cfg(feature = "full")]
    pub fn visit_pat_range_mut<V>(v: &mut V, node: &mut PatRange)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_expr_mut(&mut *node.lo);
        v.visit_range_limits_mut(&mut node.limits);
        v.visit_expr_mut(&mut *node.hi);
    }
    #[cfg(feature = "full")]
    pub fn visit_pat_reference_mut<V>(v: &mut V, node: &mut PatReference)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.and_token.spans);
        if let Some(it) = &mut node.mutability {
            tokens_helper(v, &mut it.span);
        }
        v.visit_pat_mut(&mut *node.pat);
    }
    #[cfg(feature = "full")]
    pub fn visit_pat_rest_mut<V>(v: &mut V, node: &mut PatRest)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.dot2_token.spans);
    }
    #[cfg(feature = "full")]
    pub fn visit_pat_slice_mut<V>(v: &mut V, node: &mut PatSlice)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.bracket_token.span);
        for el in Punctuated::pairs_mut(&mut node.elems) {
            let (it, p) = el.into_tuple();
            v.visit_pat_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_pat_struct_mut<V>(v: &mut V, node: &mut PatStruct)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_path_mut(&mut node.path);
        tokens_helper(v, &mut node.brace_token.span);
        for el in Punctuated::pairs_mut(&mut node.fields) {
            let (it, p) = el.into_tuple();
            v.visit_field_pat_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
        if let Some(it) = &mut node.dot2_token {
            tokens_helper(v, &mut it.spans);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_pat_tuple_mut<V>(v: &mut V, node: &mut PatTuple)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.paren_token.span);
        for el in Punctuated::pairs_mut(&mut node.elems) {
            let (it, p) = el.into_tuple();
            v.visit_pat_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_pat_tuple_struct_mut<V>(v: &mut V, node: &mut PatTupleStruct)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_path_mut(&mut node.path);
        v.visit_pat_tuple_mut(&mut node.pat);
    }
    #[cfg(feature = "full")]
    pub fn visit_pat_type_mut<V>(v: &mut V, node: &mut PatType)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_pat_mut(&mut *node.pat);
        tokens_helper(v, &mut node.colon_token.spans);
        v.visit_type_mut(&mut *node.ty);
    }
    #[cfg(feature = "full")]
    pub fn visit_pat_wild_mut<V>(v: &mut V, node: &mut PatWild)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.underscore_token.spans);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_path_mut<V>(v: &mut V, node: &mut Path)
    where
        V: VisitMut + ?Sized,
    {
        if let Some(it) = &mut node.leading_colon {
            tokens_helper(v, &mut it.spans);
        }
        for el in Punctuated::pairs_mut(&mut node.segments) {
            let (it, p) = el.into_tuple();
            v.visit_path_segment_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_path_arguments_mut<V>(v: &mut V, node: &mut PathArguments)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            PathArguments::None => {}
            PathArguments::AngleBracketed(_binding_0) => {
                v.visit_angle_bracketed_generic_arguments_mut(_binding_0);
            }
            PathArguments::Parenthesized(_binding_0) => {
                v.visit_parenthesized_generic_arguments_mut(_binding_0);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_path_segment_mut<V>(v: &mut V, node: &mut PathSegment)
    where
        V: VisitMut + ?Sized,
    {
        v.visit_ident_mut(&mut node.ident);
        v.visit_path_arguments_mut(&mut node.arguments);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_predicate_eq_mut<V>(v: &mut V, node: &mut PredicateEq)
    where
        V: VisitMut + ?Sized,
    {
        v.visit_type_mut(&mut node.lhs_ty);
        tokens_helper(v, &mut node.eq_token.spans);
        v.visit_type_mut(&mut node.rhs_ty);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_predicate_lifetime_mut<V>(v: &mut V, node: &mut PredicateLifetime)
    where
        V: VisitMut + ?Sized,
    {
        v.visit_lifetime_mut(&mut node.lifetime);
        tokens_helper(v, &mut node.colon_token.spans);
        for el in Punctuated::pairs_mut(&mut node.bounds) {
            let (it, p) = el.into_tuple();
            v.visit_lifetime_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_predicate_type_mut<V>(v: &mut V, node: &mut PredicateType)
    where
        V: VisitMut + ?Sized,
    {
        if let Some(it) = &mut node.lifetimes {
            v.visit_bound_lifetimes_mut(it);
        }
        v.visit_type_mut(&mut node.bounded_ty);
        tokens_helper(v, &mut node.colon_token.spans);
        for el in Punctuated::pairs_mut(&mut node.bounds) {
            let (it, p) = el.into_tuple();
            v.visit_type_param_bound_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_qself_mut<V>(v: &mut V, node: &mut QSelf)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.lt_token.spans);
        v.visit_type_mut(&mut *node.ty);
        skip!(node.position);
        if let Some(it) = &mut node.as_token {
            tokens_helper(v, &mut it.span);
        }
        tokens_helper(v, &mut node.gt_token.spans);
    }
    #[cfg(feature = "full")]
    pub fn visit_range_limits_mut<V>(v: &mut V, node: &mut RangeLimits)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            RangeLimits::HalfOpen(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            RangeLimits::Closed(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_receiver_mut<V>(v: &mut V, node: &mut Receiver)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        if let Some(it) = &mut node.reference {
            tokens_helper(v, &mut (it).0.spans);
            if let Some(it) = &mut (it).1 {
                v.visit_lifetime_mut(it);
            }
        }
        if let Some(it) = &mut node.mutability {
            tokens_helper(v, &mut it.span);
        }
        tokens_helper(v, &mut node.self_token.span);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_return_type_mut<V>(v: &mut V, node: &mut ReturnType)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            ReturnType::Default => {}
            ReturnType::Type(_binding_0, _binding_1) => {
                tokens_helper(v, &mut _binding_0.spans);
                v.visit_type_mut(&mut **_binding_1);
            }
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_signature_mut<V>(v: &mut V, node: &mut Signature)
    where
        V: VisitMut + ?Sized,
    {
        if let Some(it) = &mut node.constness {
            tokens_helper(v, &mut it.span);
        }
        if let Some(it) = &mut node.asyncness {
            tokens_helper(v, &mut it.span);
        }
        if let Some(it) = &mut node.unsafety {
            tokens_helper(v, &mut it.span);
        }
        if let Some(it) = &mut node.abi {
            v.visit_abi_mut(it);
        }
        tokens_helper(v, &mut node.fn_token.span);
        v.visit_ident_mut(&mut node.ident);
        v.visit_generics_mut(&mut node.generics);
        tokens_helper(v, &mut node.paren_token.span);
        for el in Punctuated::pairs_mut(&mut node.inputs) {
            let (it, p) = el.into_tuple();
            v.visit_fn_arg_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
        if let Some(it) = &mut node.variadic {
            v.visit_variadic_mut(it);
        }
        v.visit_return_type_mut(&mut node.output);
    }
    pub fn visit_span_mut<V>(v: &mut V, node: &mut Span)
    where
        V: VisitMut + ?Sized,
    {}
    #[cfg(feature = "full")]
    pub fn visit_stmt_mut<V>(v: &mut V, node: &mut Stmt)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            Stmt::Local(_binding_0) => {
                v.visit_local_mut(_binding_0);
            }
            Stmt::Item(_binding_0) => {
                v.visit_item_mut(_binding_0);
            }
            Stmt::Expr(_binding_0) => {
                v.visit_expr_mut(_binding_0);
            }
            Stmt::Semi(_binding_0, _binding_1) => {
                v.visit_expr_mut(_binding_0);
                tokens_helper(v, &mut _binding_1.spans);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_trait_bound_mut<V>(v: &mut V, node: &mut TraitBound)
    where
        V: VisitMut + ?Sized,
    {
        if let Some(it) = &mut node.paren_token {
            tokens_helper(v, &mut it.span);
        }
        v.visit_trait_bound_modifier_mut(&mut node.modifier);
        if let Some(it) = &mut node.lifetimes {
            v.visit_bound_lifetimes_mut(it);
        }
        v.visit_path_mut(&mut node.path);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_trait_bound_modifier_mut<V>(v: &mut V, node: &mut TraitBoundModifier)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            TraitBoundModifier::None => {}
            TraitBoundModifier::Maybe(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_trait_item_mut<V>(v: &mut V, node: &mut TraitItem)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            TraitItem::Const(_binding_0) => {
                v.visit_trait_item_const_mut(_binding_0);
            }
            TraitItem::Method(_binding_0) => {
                v.visit_trait_item_method_mut(_binding_0);
            }
            TraitItem::Type(_binding_0) => {
                v.visit_trait_item_type_mut(_binding_0);
            }
            TraitItem::Macro(_binding_0) => {
                v.visit_trait_item_macro_mut(_binding_0);
            }
            TraitItem::Verbatim(_binding_0) => {
                skip!(_binding_0);
            }
            #[cfg(syn_no_non_exhaustive)]
            _ => unreachable!(),
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_trait_item_const_mut<V>(v: &mut V, node: &mut TraitItemConst)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.const_token.span);
        v.visit_ident_mut(&mut node.ident);
        tokens_helper(v, &mut node.colon_token.spans);
        v.visit_type_mut(&mut node.ty);
        if let Some(it) = &mut node.default {
            tokens_helper(v, &mut (it).0.spans);
            v.visit_expr_mut(&mut (it).1);
        }
        tokens_helper(v, &mut node.semi_token.spans);
    }
    #[cfg(feature = "full")]
    pub fn visit_trait_item_macro_mut<V>(v: &mut V, node: &mut TraitItemMacro)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_macro_mut(&mut node.mac);
        if let Some(it) = &mut node.semi_token {
            tokens_helper(v, &mut it.spans);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_trait_item_method_mut<V>(v: &mut V, node: &mut TraitItemMethod)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_signature_mut(&mut node.sig);
        if let Some(it) = &mut node.default {
            v.visit_block_mut(it);
        }
        if let Some(it) = &mut node.semi_token {
            tokens_helper(v, &mut it.spans);
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_trait_item_type_mut<V>(v: &mut V, node: &mut TraitItemType)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.type_token.span);
        v.visit_ident_mut(&mut node.ident);
        v.visit_generics_mut(&mut node.generics);
        if let Some(it) = &mut node.colon_token {
            tokens_helper(v, &mut it.spans);
        }
        for el in Punctuated::pairs_mut(&mut node.bounds) {
            let (it, p) = el.into_tuple();
            v.visit_type_param_bound_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
        if let Some(it) = &mut node.default {
            tokens_helper(v, &mut (it).0.spans);
            v.visit_type_mut(&mut (it).1);
        }
        tokens_helper(v, &mut node.semi_token.spans);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_mut<V>(v: &mut V, node: &mut Type)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            Type::Array(_binding_0) => {
                v.visit_type_array_mut(_binding_0);
            }
            Type::BareFn(_binding_0) => {
                v.visit_type_bare_fn_mut(_binding_0);
            }
            Type::Group(_binding_0) => {
                v.visit_type_group_mut(_binding_0);
            }
            Type::ImplTrait(_binding_0) => {
                v.visit_type_impl_trait_mut(_binding_0);
            }
            Type::Infer(_binding_0) => {
                v.visit_type_infer_mut(_binding_0);
            }
            Type::Macro(_binding_0) => {
                v.visit_type_macro_mut(_binding_0);
            }
            Type::Never(_binding_0) => {
                v.visit_type_never_mut(_binding_0);
            }
            Type::Paren(_binding_0) => {
                v.visit_type_paren_mut(_binding_0);
            }
            Type::Path(_binding_0) => {
                v.visit_type_path_mut(_binding_0);
            }
            Type::Ptr(_binding_0) => {
                v.visit_type_ptr_mut(_binding_0);
            }
            Type::Reference(_binding_0) => {
                v.visit_type_reference_mut(_binding_0);
            }
            Type::Slice(_binding_0) => {
                v.visit_type_slice_mut(_binding_0);
            }
            Type::TraitObject(_binding_0) => {
                v.visit_type_trait_object_mut(_binding_0);
            }
            Type::Tuple(_binding_0) => {
                v.visit_type_tuple_mut(_binding_0);
            }
            Type::Verbatim(_binding_0) => {
                skip!(_binding_0);
            }
            #[cfg(syn_no_non_exhaustive)]
            _ => unreachable!(),
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_array_mut<V>(v: &mut V, node: &mut TypeArray)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.bracket_token.span);
        v.visit_type_mut(&mut *node.elem);
        tokens_helper(v, &mut node.semi_token.spans);
        v.visit_expr_mut(&mut node.len);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_bare_fn_mut<V>(v: &mut V, node: &mut TypeBareFn)
    where
        V: VisitMut + ?Sized,
    {
        if let Some(it) = &mut node.lifetimes {
            v.visit_bound_lifetimes_mut(it);
        }
        if let Some(it) = &mut node.unsafety {
            tokens_helper(v, &mut it.span);
        }
        if let Some(it) = &mut node.abi {
            v.visit_abi_mut(it);
        }
        tokens_helper(v, &mut node.fn_token.span);
        tokens_helper(v, &mut node.paren_token.span);
        for el in Punctuated::pairs_mut(&mut node.inputs) {
            let (it, p) = el.into_tuple();
            v.visit_bare_fn_arg_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
        if let Some(it) = &mut node.variadic {
            v.visit_variadic_mut(it);
        }
        v.visit_return_type_mut(&mut node.output);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_group_mut<V>(v: &mut V, node: &mut TypeGroup)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.group_token.span);
        v.visit_type_mut(&mut *node.elem);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_impl_trait_mut<V>(v: &mut V, node: &mut TypeImplTrait)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.impl_token.span);
        for el in Punctuated::pairs_mut(&mut node.bounds) {
            let (it, p) = el.into_tuple();
            v.visit_type_param_bound_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_infer_mut<V>(v: &mut V, node: &mut TypeInfer)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.underscore_token.spans);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_macro_mut<V>(v: &mut V, node: &mut TypeMacro)
    where
        V: VisitMut + ?Sized,
    {
        v.visit_macro_mut(&mut node.mac);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_never_mut<V>(v: &mut V, node: &mut TypeNever)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.bang_token.spans);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_param_mut<V>(v: &mut V, node: &mut TypeParam)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_ident_mut(&mut node.ident);
        if let Some(it) = &mut node.colon_token {
            tokens_helper(v, &mut it.spans);
        }
        for el in Punctuated::pairs_mut(&mut node.bounds) {
            let (it, p) = el.into_tuple();
            v.visit_type_param_bound_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
        if let Some(it) = &mut node.eq_token {
            tokens_helper(v, &mut it.spans);
        }
        if let Some(it) = &mut node.default {
            v.visit_type_mut(it);
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_param_bound_mut<V>(v: &mut V, node: &mut TypeParamBound)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            TypeParamBound::Trait(_binding_0) => {
                v.visit_trait_bound_mut(_binding_0);
            }
            TypeParamBound::Lifetime(_binding_0) => {
                v.visit_lifetime_mut(_binding_0);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_paren_mut<V>(v: &mut V, node: &mut TypeParen)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.paren_token.span);
        v.visit_type_mut(&mut *node.elem);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_path_mut<V>(v: &mut V, node: &mut TypePath)
    where
        V: VisitMut + ?Sized,
    {
        if let Some(it) = &mut node.qself {
            v.visit_qself_mut(it);
        }
        v.visit_path_mut(&mut node.path);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_ptr_mut<V>(v: &mut V, node: &mut TypePtr)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.star_token.spans);
        if let Some(it) = &mut node.const_token {
            tokens_helper(v, &mut it.span);
        }
        if let Some(it) = &mut node.mutability {
            tokens_helper(v, &mut it.span);
        }
        v.visit_type_mut(&mut *node.elem);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_reference_mut<V>(v: &mut V, node: &mut TypeReference)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.and_token.spans);
        if let Some(it) = &mut node.lifetime {
            v.visit_lifetime_mut(it);
        }
        if let Some(it) = &mut node.mutability {
            tokens_helper(v, &mut it.span);
        }
        v.visit_type_mut(&mut *node.elem);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_slice_mut<V>(v: &mut V, node: &mut TypeSlice)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.bracket_token.span);
        v.visit_type_mut(&mut *node.elem);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_trait_object_mut<V>(v: &mut V, node: &mut TypeTraitObject)
    where
        V: VisitMut + ?Sized,
    {
        if let Some(it) = &mut node.dyn_token {
            tokens_helper(v, &mut it.span);
        }
        for el in Punctuated::pairs_mut(&mut node.bounds) {
            let (it, p) = el.into_tuple();
            v.visit_type_param_bound_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_type_tuple_mut<V>(v: &mut V, node: &mut TypeTuple)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.paren_token.span);
        for el in Punctuated::pairs_mut(&mut node.elems) {
            let (it, p) = el.into_tuple();
            v.visit_type_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_un_op_mut<V>(v: &mut V, node: &mut UnOp)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            UnOp::Deref(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            UnOp::Not(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
            UnOp::Neg(_binding_0) => {
                tokens_helper(v, &mut _binding_0.spans);
            }
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_use_glob_mut<V>(v: &mut V, node: &mut UseGlob)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.star_token.spans);
    }
    #[cfg(feature = "full")]
    pub fn visit_use_group_mut<V>(v: &mut V, node: &mut UseGroup)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.brace_token.span);
        for el in Punctuated::pairs_mut(&mut node.items) {
            let (it, p) = el.into_tuple();
            v.visit_use_tree_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(feature = "full")]
    pub fn visit_use_name_mut<V>(v: &mut V, node: &mut UseName)
    where
        V: VisitMut + ?Sized,
    {
        v.visit_ident_mut(&mut node.ident);
    }
    #[cfg(feature = "full")]
    pub fn visit_use_path_mut<V>(v: &mut V, node: &mut UsePath)
    where
        V: VisitMut + ?Sized,
    {
        v.visit_ident_mut(&mut node.ident);
        tokens_helper(v, &mut node.colon2_token.spans);
        v.visit_use_tree_mut(&mut *node.tree);
    }
    #[cfg(feature = "full")]
    pub fn visit_use_rename_mut<V>(v: &mut V, node: &mut UseRename)
    where
        V: VisitMut + ?Sized,
    {
        v.visit_ident_mut(&mut node.ident);
        tokens_helper(v, &mut node.as_token.span);
        v.visit_ident_mut(&mut node.rename);
    }
    #[cfg(feature = "full")]
    pub fn visit_use_tree_mut<V>(v: &mut V, node: &mut UseTree)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            UseTree::Path(_binding_0) => {
                v.visit_use_path_mut(_binding_0);
            }
            UseTree::Name(_binding_0) => {
                v.visit_use_name_mut(_binding_0);
            }
            UseTree::Rename(_binding_0) => {
                v.visit_use_rename_mut(_binding_0);
            }
            UseTree::Glob(_binding_0) => {
                v.visit_use_glob_mut(_binding_0);
            }
            UseTree::Group(_binding_0) => {
                v.visit_use_group_mut(_binding_0);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_variadic_mut<V>(v: &mut V, node: &mut Variadic)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        tokens_helper(v, &mut node.dots.spans);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_variant_mut<V>(v: &mut V, node: &mut Variant)
    where
        V: VisitMut + ?Sized,
    {
        for it in &mut node.attrs {
            v.visit_attribute_mut(it);
        }
        v.visit_ident_mut(&mut node.ident);
        v.visit_fields_mut(&mut node.fields);
        if let Some(it) = &mut node.discriminant {
            tokens_helper(v, &mut (it).0.spans);
            v.visit_expr_mut(&mut (it).1);
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_vis_crate_mut<V>(v: &mut V, node: &mut VisCrate)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.crate_token.span);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_vis_public_mut<V>(v: &mut V, node: &mut VisPublic)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.pub_token.span);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_vis_restricted_mut<V>(v: &mut V, node: &mut VisRestricted)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.pub_token.span);
        tokens_helper(v, &mut node.paren_token.span);
        if let Some(it) = &mut node.in_token {
            tokens_helper(v, &mut it.span);
        }
        v.visit_path_mut(&mut *node.path);
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_visibility_mut<V>(v: &mut V, node: &mut Visibility)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            Visibility::Public(_binding_0) => {
                v.visit_vis_public_mut(_binding_0);
            }
            Visibility::Crate(_binding_0) => {
                v.visit_vis_crate_mut(_binding_0);
            }
            Visibility::Restricted(_binding_0) => {
                v.visit_vis_restricted_mut(_binding_0);
            }
            Visibility::Inherited => {}
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_where_clause_mut<V>(v: &mut V, node: &mut WhereClause)
    where
        V: VisitMut + ?Sized,
    {
        tokens_helper(v, &mut node.where_token.span);
        for el in Punctuated::pairs_mut(&mut node.predicates) {
            let (it, p) = el.into_tuple();
            v.visit_where_predicate_mut(it);
            if let Some(p) = p {
                tokens_helper(v, &mut p.spans);
            }
        }
    }
    #[cfg(any(feature = "derive", feature = "full"))]
    pub fn visit_where_predicate_mut<V>(v: &mut V, node: &mut WherePredicate)
    where
        V: VisitMut + ?Sized,
    {
        match node {
            WherePredicate::Type(_binding_0) => {
                v.visit_predicate_type_mut(_binding_0);
            }
            WherePredicate::Lifetime(_binding_0) => {
                v.visit_predicate_lifetime_mut(_binding_0);
            }
            WherePredicate::Eq(_binding_0) => {
                v.visit_predicate_eq_mut(_binding_0);
            }
        }
    }