Struct rustc_expand::mbe::diagnostics::CollectTrackerAndEmitter
source · 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.
Fields§
§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>>
Implementations§
Trait Implementations§
source§impl<'a, 'cx, 'matcher> Tracker<'matcher> for CollectTrackerAndEmitter<'a, 'cx, 'matcher>
impl<'a, 'cx, 'matcher> Tracker<'matcher> for CollectTrackerAndEmitter<'a, 'cx, 'matcher>
source§fn build_failure(
tok: Token,
position: usize,
msg: &'static str
) -> Self::Failure
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.source§fn before_match_loc(&mut self, parser: &TtParser, matcher: &'matcher MatcherLoc)
fn before_match_loc(&mut self, parser: &TtParser, matcher: &'matcher MatcherLoc)
This is called before trying to match next MatcherLoc on the current token.
source§fn after_arm(
&mut self,
result: &ParseResult<FxHashMap<MacroRulesNormalizedIdent, NamedMatch>, Self::Failure>
)
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
).source§fn description() -> &'static str
fn description() -> &'static str
For tracing.
fn recovery() -> Recovery
Auto Trait Implementations§
impl<'a, 'cx, 'matcher> !RefUnwindSafe for CollectTrackerAndEmitter<'a, 'cx, 'matcher>
impl<'a, 'cx, 'matcher> !Send for CollectTrackerAndEmitter<'a, 'cx, 'matcher>
impl<'a, 'cx, 'matcher> !Sync for CollectTrackerAndEmitter<'a, 'cx, 'matcher>
impl<'a, 'cx, 'matcher> Unpin for CollectTrackerAndEmitter<'a, 'cx, 'matcher>
impl<'a, 'cx, 'matcher> !UnwindSafe for CollectTrackerAndEmitter<'a, 'cx, 'matcher>
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
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