Trait Error 

pub trait Error: Sized {
    // Required method
    fn custom(msg: impl Display) -> Self;

    // Provided methods
    fn invalid_product_length<'de, T>(len: usize, expected: &T) -> Self
       where T: ProductVisitor<'de> { ... }
    fn missing_field<'de, T>(
        index: usize,
        field_name: Option<&str>,
        prod: &T,
    ) -> Self
       where T: ProductVisitor<'de> { ... }
    fn duplicate_field<'de, T>(
        index: usize,
        field_name: Option<&str>,
        prod: &T,
    ) -> Self
       where T: ProductVisitor<'de> { ... }
    fn unknown_field_name<'de, T>(field_name: &str, expected: &T) -> Self
       where T: FieldNameVisitor<'de> { ... }
    fn unknown_variant_tag<'de, T>(tag: u8, expected: &T) -> Self
       where T: SumVisitor<'de> { ... }
    fn unknown_variant_name<'de, T>(name: &str, expected: &T) -> Self
       where T: VariantVisitor<'de> { ... }
}

The Error trait allows Deserialize implementations to create descriptive error messages belonging to the Deserializer against which they are currently running.

Every Deserializer declares an Error type that encompasses both general-purpose deserialization errors as well as errors specific to the particular deserialization format.

Most deserializers should only need to provide the Error::custom method and inherit the default behavior for the other methods.

Required Methods

fn custom(msg: impl Display) -> Self

Raised when there is general error when deserializing a type.

Provided Methods

fn invalid_product_length<'de, T>(len: usize, expected: &T) -> Self

where T: ProductVisitor<'de>,

The product length was not as promised.

fn missing_field<'de, T>( index: usize, field_name: Option<&str>, prod: &T, ) -> Self

where T: ProductVisitor<'de>,

There was a missing field at index.

fn duplicate_field<'de, T>( index: usize, field_name: Option<&str>, prod: &T, ) -> Self

where T: ProductVisitor<'de>,

A field with index was specified more than once.

fn unknown_field_name<'de, T>(field_name: &str, expected: &T) -> Self

where T: FieldNameVisitor<'de>,

A field with name field_name does not exist.

fn unknown_variant_tag<'de, T>(tag: u8, expected: &T) -> Self

where T: SumVisitor<'de>,

The tag does not specify a variant of the sum type.

fn unknown_variant_name<'de, T>(name: &str, expected: &T) -> Self

where T: VariantVisitor<'de>,

The name is not that of a variant of the sum type.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl Error for DecodeError

impl Error for ValueDeserializeError

impl<E> Error for SerdeError<E>

where E: Error,