Trait rustc_expand::mbe::macro_rules::Tracker

pub(super) trait Tracker<'matcher> {
    fn before_match_loc(
        &mut self,
        parser: &TtParser,
        matcher: &'matcher MatcherLoc
    );
    fn after_arm(
        &mut self,
        result: &ParseResult<FxHashMap<MacroRulesNormalizedIdent, NamedMatch>>
    );
    fn description() -> &'static str;
    fn recovery() -> Recovery;
}

Required Methods

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

This is called before trying to match next MatcherLoc on the current token.

fn after_arm(
    &mut self,
    result: &ParseResult<FxHashMap<MacroRulesNormalizedIdent, NamedMatch>>
)

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).

fn description() -> &'static str

For tracing.

fn recovery() -> Recovery

Implementors

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

impl<'matcher> Tracker<'matcher> for NoopTracker