Enum serde_syn::Error

pub enum Error {
    Syn(SynError),
    Custom(String),
}

A serde deserialization error which wraps syn::Error or a custom string. The Syn variant is preferred when possible, since it tracks the location in the input syntax where the error occurred.

Variants

Syn(SynError)Custom(String)

Methods

impl Error

pub fn span(&self) -> Option<Span>

Returns the location in the input syntax where this error occurred if one is known.

pub fn with_span(self, span: Span) -> Error

Attaches a span to this error if needed.

pub fn to_syn(self, span: Span) -> SynError

Converts self to a syn::Error by attaching a span if needed.

let err = Error::custom("an error");
assert!(err.span().is_none());
let syn_err = err.to_syn(Span::call_site());
println!("{:?}", syn_err.span());

Trait Implementations

impl From<Error> for Error

fn from(err: SynError) -> Error

Performs the conversion.

impl Display for Error

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Debug for Error

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Error for Error

fn description(&self) -> &str

This method is soft-deprecated.

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

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

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

Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

The lower-level cause of this error, if any.

impl Error for Error

fn custom<T: Display>(msg: T) -> Self

Raised when there is general error when deserializing a type.

fn invalid_type(unexp: Unexpected, exp: &dyn Expected) -> Self

Raised when a Deserialize receives a type different from what it was expecting.

fn invalid_value(unexp: Unexpected, exp: &dyn Expected) -> Self

Raised when a Deserialize receives a value of the right type but that is wrong for some other reason.

fn invalid_length(len: usize, exp: &dyn Expected) -> Self

Raised when deserializing a sequence or map and the input data contains too many or too few elements.

fn unknown_variant(variant: &str, expected: &'static [&'static str]) -> Self

Raised when a Deserialize enum type received a variant with an unrecognized name.

fn unknown_field(field: &str, expected: &'static [&'static str]) -> Self

Raised when a Deserialize struct type received a field with an unrecognized name.

fn missing_field(field: &'static str) -> Self

Raised when a Deserialize struct type expected to receive a required field with a particular name but that field was not present in the input.

fn duplicate_field(field: &'static str) -> Self

Raised when a Deserialize struct type received more than one of the same field.