struct CollectTrackerAndEmitter<'a, 'cx, 'matcher> {
    cx: &'a mut ExtCtxt<'cx>,
    remaining_matcher: Option<&'matcher MatcherLoc>,
    best_failure: Option<BestFailure>,
    root_span: Span,
    result: Option<Box<dyn MacResult + 'cx>>,
}
Expand description

The tracker used for the slow error path that collects useful info for diagnostics.

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§cx: &'a mut ExtCtxt<'cx>§remaining_matcher: Option<&'matcher MatcherLoc>§best_failure: Option<BestFailure>

Which arm’s failure should we report? (the one furthest along)

§root_span: Span§result: Option<Box<dyn MacResult + 'cx>>

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impl<'a, 'cx> CollectTrackerAndEmitter<'a, 'cx, '_>

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fn new(cx: &'a mut ExtCtxt<'cx>, root_span: Span) -> Self

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impl<'a, 'cx, 'matcher> Tracker<'matcher> for CollectTrackerAndEmitter<'a, 'cx, '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 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 description() -> &'static str

For tracing.
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fn recovery() -> Recovery

Auto Trait Implementations§

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impl<'a, 'cx, 'matcher> !RefUnwindSafe for CollectTrackerAndEmitter<'a, 'cx, 'matcher>

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impl<'a, 'cx, 'matcher> !Send for CollectTrackerAndEmitter<'a, 'cx, 'matcher>

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impl<'a, 'cx, 'matcher> !Sync for CollectTrackerAndEmitter<'a, 'cx, 'matcher>

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impl<'a, 'cx, 'matcher> Unpin for CollectTrackerAndEmitter<'a, 'cx, 'matcher>

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impl<'a, 'cx, 'matcher> !UnwindSafe for CollectTrackerAndEmitter<'a, 'cx, 'matcher>

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impl<T> Any for Twhere 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 Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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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

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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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, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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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 Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

Layout§

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: 128 bytes