Enum rustc_expand::mbe::macro_parser::NamedMatch

pub(crate) enum NamedMatch {
    MatchedSeq(Lrc<SmallVec<[NamedMatch; 4]>>),
    MatchedNonterminal(Lrc<Nonterminal>),
}

NamedMatch is a pattern-match result for a single token::MATCH_NONTERMINAL: so it is associated with a single ident in a parse, and all MatchedNonterminals in the NamedMatch have the same non-terminal type (expr, item, etc). Each leaf in a single NamedMatch corresponds to a single token::MATCH_NONTERMINAL in the TokenTree that produced it.

The in-memory structure of a particular NamedMatch represents the match that occurred when a particular subset of a matcher was applied to a particular token tree.

The width of each MatchedSeq in the NamedMatch, and the identity of the MatchedNonterminals, will depend on the token tree it was applied to: each MatchedSeq corresponds to a single TTSeq in the originating token tree. The depth of the NamedMatch structure will therefore depend only on the nesting depth of ast::TTSeqs in the originating token tree it was derived from.

Variants

MatchedSeq(Lrc<SmallVec<[NamedMatch; 4]>>)

MatchedNonterminal(Lrc<Nonterminal>)

Trait Implementations

impl Clone for NamedMatch

fn clone(&self) -> NamedMatch

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for NamedMatch

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

Formats the value using the given formatter.