struct MatcherPos {
    idx: usize,
    matches: Lrc<Vec<NamedMatch>>,
}
Expand description

A single matcher position, representing the state of matching.

Fields

idx: usize

The index into TtParser::locs, which represents the “dot”.

matches: Lrc<Vec<NamedMatch>>

The matches made against metavar decls so far. On a successful match, this vector ends up with one element per metavar decl in the matcher. Each element records token trees matched against the relevant metavar by the black box parser. An element will be a MatchedSeq if the corresponding metavar decl is within a sequence.

It is critical to performance that this is an Lrc, because it gets cloned frequently when processing sequences. Mostly for sequence-ending possibilities that must be tried but end up failing.

Implementations

Adds m as a named match for the metavar_idx-th metavar. There are only two call sites, and both are hot enough to be always worth inlining.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion 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: 16 bytes