Struct Error 

pub struct Error { /* private fields */ }

A parse or validation error with span information and a user-facing suggestion.

Convert to a compiler diagnostic with Error::to_compile_error.

Implementations

impl Error

pub fn missing_wrapper(span: Span, expected: &'static str, found: &Type) -> Self

pub fn empty_generic_args(span: Span, wrapper: &'static str) -> Self

pub fn unsupported_type( span: Span, ty: &Type, reason: &'static str, suggestion: &'static str, ) -> Self

pub fn invalid_attr_value( span: Span, attr: &str, expected: &'static str, found: &str, ) -> Self

pub fn missing_required_attr( span: Span, attr: &'static str, context: &'static str, ) -> Self

pub fn conflicting_attrs(span: Span, first: &str, second: &str) -> Self

pub fn missing_return_type(span: Span, fn_name: &str) -> Self

pub fn invalid_handler_sig( span: Span, fn_name: &str, reason: &'static str, ) -> Self

pub fn unknown_key( span: Span, key: &str, valid_keys: &'static [&'static str], ) -> Self

pub fn to_compile_error(&self) -> TokenStream

Emit a compile_error! token stream pointing at the offending span.

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Error for Error

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

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

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

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

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

Provides type-based access to context intended for error reports.

impl From<Error> for Error

fn from(e: Error) -> Self

Converts to this type from the input type.