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    ast_enum! {
        /// A binary operator: `+`, `+=`, `&`.
        ///
        /// *This type is available only if Syn is built with the `"derive"` or `"full"`
        /// feature.*
        #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
        pub enum BinOp {
            /// The `+` operator (addition)
            Add(Token![+]),
            /// The `-` operator (subtraction)
            Sub(Token![-]),
            /// The `*` operator (multiplication)
            Mul(Token![*]),
            /// The `/` operator (division)
            Div(Token![/]),
            /// The `%` operator (modulus)
            Rem(Token![%]),
            /// The `&&` operator (logical and)
            And(Token![&&]),
            /// The `||` operator (logical or)
            Or(Token![||]),
            /// The `^` operator (bitwise xor)
            BitXor(Token![^]),
            /// The `&` operator (bitwise and)
            BitAnd(Token![&]),
            /// The `|` operator (bitwise or)
            BitOr(Token![|]),
            /// The `<<` operator (shift left)
            Shl(Token![<<]),
            /// The `>>` operator (shift right)
            Shr(Token![>>]),
            /// The `==` operator (equality)
            Eq(Token![==]),
            /// The `<` operator (less than)
            Lt(Token![<]),
            /// The `<=` operator (less than or equal to)
            Le(Token![<=]),
            /// The `!=` operator (not equal to)
            Ne(Token![!=]),
            /// The `>=` operator (greater than or equal to)
            Ge(Token![>=]),
            /// The `>` operator (greater than)
            Gt(Token![>]),
            /// The `+=` operator
            AddEq(Token![+=]),
            /// The `-=` operator
            SubEq(Token![-=]),
            /// The `*=` operator
            MulEq(Token![*=]),
            /// The `/=` operator
            DivEq(Token![/=]),
            /// The `%=` operator
            RemEq(Token![%=]),
            /// The `^=` operator
            BitXorEq(Token![^=]),
            /// The `&=` operator
            BitAndEq(Token![&=]),
            /// The `|=` operator
            BitOrEq(Token![|=]),
            /// The `<<=` operator
            ShlEq(Token![<<=]),
            /// The `>>=` operator
            ShrEq(Token![>>=]),
        }
    }

    ast_enum! {
        /// A unary operator: `*`, `!`, `-`.
        ///
        /// *This type is available only if Syn is built with the `"derive"` or `"full"`
        /// feature.*
        #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
        pub enum UnOp {
            /// The `*` operator for dereferencing
            Deref(Token![*]),
            /// The `!` operator for logical inversion
            Not(Token![!]),
            /// The `-` operator for negation
            Neg(Token![-]),
        }
    }

    #[cfg(feature = "parsing")]
    pub mod parsing {
        use super::*;
        use crate::parse::{Parse, ParseStream, Result};

        fn parse_binop(input: ParseStream) -> Result<BinOp> {
            if input.peek(Token![&&]) {
                input.parse().map(BinOp::And)
            } else if input.peek(Token![||]) {
                input.parse().map(BinOp::Or)
            } else if input.peek(Token![<<]) {
                input.parse().map(BinOp::Shl)
            } else if input.peek(Token![>>]) {
                input.parse().map(BinOp::Shr)
            } else if input.peek(Token![==]) {
                input.parse().map(BinOp::Eq)
            } else if input.peek(Token![<=]) {
                input.parse().map(BinOp::Le)
            } else if input.peek(Token![!=]) {
                input.parse().map(BinOp::Ne)
            } else if input.peek(Token![>=]) {
                input.parse().map(BinOp::Ge)
            } else if input.peek(Token![+]) {
                input.parse().map(BinOp::Add)
            } else if input.peek(Token![-]) {
                input.parse().map(BinOp::Sub)
            } else if input.peek(Token![*]) {
                input.parse().map(BinOp::Mul)
            } else if input.peek(Token![/]) {
                input.parse().map(BinOp::Div)
            } else if input.peek(Token![%]) {
                input.parse().map(BinOp::Rem)
            } else if input.peek(Token![^]) {
                input.parse().map(BinOp::BitXor)
            } else if input.peek(Token![&]) {
                input.parse().map(BinOp::BitAnd)
            } else if input.peek(Token![|]) {
                input.parse().map(BinOp::BitOr)
            } else if input.peek(Token![<]) {
                input.parse().map(BinOp::Lt)
            } else if input.peek(Token![>]) {
                input.parse().map(BinOp::Gt)
            } else {
                Err(input.error("expected binary operator"))
            }
        }

        #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
        impl Parse for BinOp {
            #[cfg(not(feature = "full"))]
            fn parse(input: ParseStream) -> Result<Self> {
                parse_binop(input)
            }

            #[cfg(feature = "full")]
            fn parse(input: ParseStream) -> Result<Self> {
                if input.peek(Token![+=]) {
                    input.parse().map(BinOp::AddEq)
                } else if input.peek(Token![-=]) {
                    input.parse().map(BinOp::SubEq)
                } else if input.peek(Token![*=]) {
                    input.parse().map(BinOp::MulEq)
                } else if input.peek(Token![/=]) {
                    input.parse().map(BinOp::DivEq)
                } else if input.peek(Token![%=]) {
                    input.parse().map(BinOp::RemEq)
                } else if input.peek(Token![^=]) {
                    input.parse().map(BinOp::BitXorEq)
                } else if input.peek(Token![&=]) {
                    input.parse().map(BinOp::BitAndEq)
                } else if input.peek(Token![|=]) {
                    input.parse().map(BinOp::BitOrEq)
                } else if input.peek(Token![<<=]) {
                    input.parse().map(BinOp::ShlEq)
                } else if input.peek(Token![>>=]) {
                    input.parse().map(BinOp::ShrEq)
                } else {
                    parse_binop(input)
                }
            }
        }

        #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
        impl Parse for UnOp {
            fn parse(input: ParseStream) -> Result<Self> {
                let lookahead = input.lookahead1();
                if lookahead.peek(Token![*]) {
                    input.parse().map(UnOp::Deref)
                } else if lookahead.peek(Token![!]) {
                    input.parse().map(UnOp::Not)
                } else if lookahead.peek(Token![-]) {
                    input.parse().map(UnOp::Neg)
                } else {
                    Err(lookahead.error())
                }
            }
        }
    }

    #[cfg(feature = "printing")]
    mod printing {
        use super::*;
        use proc_macro2::TokenStream;
        use quote::ToTokens;

        #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
        impl ToTokens for BinOp {
            fn to_tokens(&self, tokens: &mut TokenStream) {
                match self {
                    BinOp::Add(t) => t.to_tokens(tokens),
                    BinOp::Sub(t) => t.to_tokens(tokens),
                    BinOp::Mul(t) => t.to_tokens(tokens),
                    BinOp::Div(t) => t.to_tokens(tokens),
                    BinOp::Rem(t) => t.to_tokens(tokens),
                    BinOp::And(t) => t.to_tokens(tokens),
                    BinOp::Or(t) => t.to_tokens(tokens),
                    BinOp::BitXor(t) => t.to_tokens(tokens),
                    BinOp::BitAnd(t) => t.to_tokens(tokens),
                    BinOp::BitOr(t) => t.to_tokens(tokens),
                    BinOp::Shl(t) => t.to_tokens(tokens),
                    BinOp::Shr(t) => t.to_tokens(tokens),
                    BinOp::Eq(t) => t.to_tokens(tokens),
                    BinOp::Lt(t) => t.to_tokens(tokens),
                    BinOp::Le(t) => t.to_tokens(tokens),
                    BinOp::Ne(t) => t.to_tokens(tokens),
                    BinOp::Ge(t) => t.to_tokens(tokens),
                    BinOp::Gt(t) => t.to_tokens(tokens),
                    BinOp::AddEq(t) => t.to_tokens(tokens),
                    BinOp::SubEq(t) => t.to_tokens(tokens),
                    BinOp::MulEq(t) => t.to_tokens(tokens),
                    BinOp::DivEq(t) => t.to_tokens(tokens),
                    BinOp::RemEq(t) => t.to_tokens(tokens),
                    BinOp::BitXorEq(t) => t.to_tokens(tokens),
                    BinOp::BitAndEq(t) => t.to_tokens(tokens),
                    BinOp::BitOrEq(t) => t.to_tokens(tokens),
                    BinOp::ShlEq(t) => t.to_tokens(tokens),
                    BinOp::ShrEq(t) => t.to_tokens(tokens),
                }
            }
        }

        #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
        impl ToTokens for UnOp {
            fn to_tokens(&self, tokens: &mut TokenStream) {
                match self {
                    UnOp::Deref(t) => t.to_tokens(tokens),
                    UnOp::Not(t) => t.to_tokens(tokens),
                    UnOp::Neg(t) => t.to_tokens(tokens),
                }
            }
        }
    }