bendns' repos / rust-analyzer
Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/parser/src/grammar/patterns.rs')
-rw-r--r--crates/parser/src/grammar/patterns.rs13
1 files changed, 9 insertions, 4 deletions
diff --git a/crates/parser/src/grammar/patterns.rs b/crates/parser/src/grammar/patterns.rs
index 7e21a808da..bc1224af9b 100644
--- a/crates/parser/src/grammar/patterns.rs
+++ b/crates/parser/src/grammar/patterns.rs
@@ -13,6 +13,8 @@ pub(super) const PATTERN_FIRST: TokenSet =
T![.],
]));
+const PAT_TOP_FIRST: TokenSet = PATTERN_FIRST.union(TokenSet::new(&[T![|]]));
+
pub(crate) fn pattern(p: &mut Parser<'_>) {
pattern_r(p, PAT_RECOVERY_SET);
}
@@ -228,6 +230,7 @@ fn path_or_macro_pat(p: &mut Parser<'_>) -> CompletedMarker {
// let S(_) = ();
// let S(_,) = ();
// let S(_, .. , x) = ();
+// let S(| a) = ();
// }
fn tuple_pat_fields(p: &mut Parser<'_>) {
assert!(p.at(T!['(']));
@@ -363,6 +366,7 @@ fn ref_pat(p: &mut Parser<'_>) -> CompletedMarker {
// let (a,) = ();
// let (..) = ();
// let () = ();
+// let (| a | a, | b) = ((),());
// }
fn tuple_pat(p: &mut Parser<'_>) -> CompletedMarker {
assert!(p.at(T!['(']));
@@ -373,13 +377,13 @@ fn tuple_pat(p: &mut Parser<'_>) -> CompletedMarker {
let mut has_rest = false;
while !p.at(EOF) && !p.at(T![')']) {
has_pat = true;
- if !p.at_ts(PATTERN_FIRST) {
+ if !p.at_ts(PAT_TOP_FIRST) {
p.error("expected a pattern");
break;
}
has_rest |= p.at(T![..]);
- pattern(p);
+ pattern_top(p);
if !p.at(T![')']) {
has_comma = true;
p.expect(T![,]);
@@ -393,6 +397,7 @@ fn tuple_pat(p: &mut Parser<'_>) -> CompletedMarker {
// test slice_pat
// fn main() {
// let [a, b, ..] = [];
+// let [| a, ..] = [];
// }
fn slice_pat(p: &mut Parser<'_>) -> CompletedMarker {
assert!(p.at(T!['[']));
@@ -405,12 +410,12 @@ fn slice_pat(p: &mut Parser<'_>) -> CompletedMarker {
fn pat_list(p: &mut Parser<'_>, ket: SyntaxKind) {
while !p.at(EOF) && !p.at(ket) {
- if !p.at_ts(PATTERN_FIRST) {
+ if !p.at_ts(PAT_TOP_FIRST) {
p.error("expected a pattern");
break;
}
- pattern(p);
+ pattern_top(p);
if !p.at(ket) {
p.expect(T![,]);
}