# Error in toml::ser - Rust
Errors that can occur when serializing a type.
Keywords: rust, rustlang, rust-lang, Error

# Enum toml::ser::Error

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    #[non_exhaustive]
    pub enum Error {
        UnsupportedType,
        KeyNotString,
        ValueAfterTable,
        DateInvalid,
        NumberInvalid,
        UnsupportedNone,
        Custom(String),
        // some variants omitted
    }

Expand description

Errors that can occur when serializing a type.

## Variants (Non-exhaustive)

This enum is marked as non-exhaustive
Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

### `UnsupportedType`

Indicates that a Rust type was requested to be serialized but it was not supported.

Currently the TOML format does not support serializing types such as enums, tuples and tuple structs.

### `KeyNotString`

The key of all TOML maps must be strings, but serialization was attempted where the key of a map was not a string.

### `ValueAfterTable`

All values in a TOML table must be emitted before further tables are emitted. If a value is emitted after a table then this error is generated.

### `DateInvalid`

A serialized date was invalid.

### `NumberInvalid`

A serialized number was invalid.

### `UnsupportedNone`

None was attempted to be serialized, but it’s not supported.

### `Custom(String)`

A custom error which could be generated when serializing a particular type.

## Trait Implementations

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### impl Clone for Error

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#### fn clone(&self) -> Error

Returns a copy of the value. Read more

1.0.0 · source

#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more

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### impl Debug for Error

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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### impl Display for Error

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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### impl Error for Error

1.30.0 · source

#### fn source(&self) -> Option<&(dyn Error + 'static)>

The lower-level source of this error, if any. Read more

1.0.0 · source

#### fn description(&self) -> &str

👎 Deprecated since 1.42.0:

use the Display impl or to_string()

Read more
1.0.0 · source

#### fn cause(&self) -> Option<&dyn Error>

👎 Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

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#### fn provide(&'a self, req: &mut Demand<'a>)

🔬 This is a nightly-only experimental API. (`error_generic_member_access`)

Provides type based access to context intended for error reports. Read more

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### impl Error for Error

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#### fn custom<T: Display>(msg: T) -> Error

Used when a `Serialize` implementation encounters any error while serializing a type. Read more

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### impl PartialEq<Error> for Error

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#### fn eq(&self, other: &Error) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

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#### fn ne(&self, other: &Error) -> bool

This method tests for `!=`.

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### impl Eq for Error

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### impl StructuralEq for Error

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### impl StructuralPartialEq for Error

## Auto Trait Implementations

### impl RefUnwindSafe for Error

### impl Send for Error

### impl Sync for Error

### impl Unpin for Error

### impl UnwindSafe for Error

## Blanket Implementations

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### impl<T> Any for T where
T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more

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### impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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### impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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### impl<T> From<T> for T

const: unstable · source

#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for T where
U: From<T>,

const: unstable · source

#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T> ToOwned for T where
T: Clone,

#### type Owned = T

The resulting type after obtaining ownership.

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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more

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### impl<T> ToString for T where
T: Display + ?Sized,

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#### default fn to_string(&self) -> String

Converts the given value to a `String`. Read more

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### impl<T, U> TryFrom<U> for T where
U: Into<T>,

#### type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

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### impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

const: unstable · source

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.