Struct rustc_expand::mbe::diagnostics::FailureForwarder

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pub struct FailureForwarder<'matcher> {
    expected_token: Option<&'matcher Token>,
}
Expand description

Currently used by macro_rules! compilation to extract a little information from the Failure case.

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§expected_token: Option<&'matcher Token>

Implementations§

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impl<'matcher> FailureForwarder<'matcher>

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pub fn new() -> Self

Trait Implementations§

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impl<'matcher> Tracker<'matcher> for FailureForwarder<'matcher>

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type Failure = (Token, usize, &'static str)

The contents of ParseResult::Failure.
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fn build_failure( tok: Token, position: usize, msg: &'static str, ) -> Self::Failure

Arm failed to match. If the token is token::Eof, it indicates an unexpected end of macro invocation. Otherwise, it indicates that no rules expected the given token. The usize is the approximate position of the token in the input token stream.
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fn description() -> &'static str

For tracing.
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fn set_expected_token(&mut self, tok: &'matcher Token)

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fn get_expected_token(&self) -> Option<&'matcher Token>

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fn before_match_loc( &mut self, _parser: &TtParser, _matcher: &'matcher MatcherLoc, )

This is called before trying to match next MatcherLoc on the current token.
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fn after_arm( &mut self, _result: &ParseResult<FxHashMap<MacroRulesNormalizedIdent, NamedMatch>, Self::Failure>, )

This is called after an arm has been parsed, either successfully or unsuccessfully. When this is called, before_match_loc was called at least once (with a MatcherLoc::Eof).
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fn recovery() -> Recovery

Auto Trait Implementations§

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impl<'matcher> DynSend for FailureForwarder<'matcher>

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impl<'matcher> DynSync for FailureForwarder<'matcher>

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impl<'matcher> Freeze for FailureForwarder<'matcher>

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impl<'matcher> !RefUnwindSafe for FailureForwarder<'matcher>

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impl<'matcher> !Send for FailureForwarder<'matcher>

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impl<'matcher> !Sync for FailureForwarder<'matcher>

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impl<'matcher> Unpin for FailureForwarder<'matcher>

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impl<'matcher> !UnwindSafe for FailureForwarder<'matcher>

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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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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where T: ?Sized,

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fn borrow(&self) -> &T

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

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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<T> Filterable for T

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fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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fn instrument(self, span: Span) -> Instrumented<Self>

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fn into_either(self, into_left: bool) -> Either<Self, Self>

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes