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Parse inline const pattern in nested patterns

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Ryo Yoshida 2023-04-16 02:30:59 +09:00
parent 89a1439de3
commit 83a93f4bd3
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3 changed files with 138 additions and 1 deletions
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11
crates/parser/src/grammar/patterns.rs
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@ -5,6 +5,7 @@ pub(super) const PATTERN_FIRST: TokenSet =
T![box],
T![ref],
T![mut],
T![const],
T!['('],
T!['['],
T![&],
@ -17,7 +18,7 @@ const PAT_TOP_FIRST: TokenSet = PATTERN_FIRST.union(TokenSet::new(&[T![|]]));
/// Set of possible tokens at the start of a range pattern's end bound.
const RANGE_PAT_END_FIRST: TokenSet =
expressions::LITERAL_FIRST.union(paths::PATH_FIRST).union(TokenSet::new(&[T![-]]));
expressions::LITERAL_FIRST.union(paths::PATH_FIRST).union(TokenSet::new(&[T![-], T![const]]));
pub(crate) fn pattern(p: &mut Parser<'_>) {
pattern_r(p, PAT_RECOVERY_SET);
@ -499,6 +500,14 @@ fn box_pat(p: &mut Parser<'_>) -> CompletedMarker {
// fn main() {
// let const { 15 } = ();
// let const { foo(); bar() } = ();
//
// match 42 {
// const { 0 } .. const { 1 } => (),
// .. const { 0 } => (),
// const { 2 } .. => (),
// }
//
// let (const { () },) = ();
// }
fn const_block_pat(p: &mut Parser<'_>) -> CompletedMarker {
assert!(p.at(T![const]));