Properly infer tuple patterns when encountering ellipsis

1 files changed, 47 insertions, 0 deletions

diff --git a/crates/hir_ty/src/tests/patterns.rs b/crates/hir_ty/src/tests/patterns.rs
index 6a965ac4f..5776de280 100644
--- a/crates/hir_ty/src/tests/patterns.rs
+++ b/crates/hir_ty/src/tests/patterns.rs
@@ -679,3 +679,50 @@ fn box_pattern() {
         "#]],
     );
 }
+
+#[test]
+fn tuple_ellipsis_pattern() {
+    check_infer(
+        r#"
+fn foo(tuple: (u8, i16, f32)) {
+    match tuple {
+        (.., b, c) => {},
+        (a, .., c) => {},
+        (a, b, ..) => {},
+        (a, b) => {/*too short*/}
+        (a, b, c, d) => {/*too long*/}
+        _ => {}
+    }
+}"#,
+        expect![[r#"
+            7..12 'tuple': (u8, i16, f32)
+            30..224 '{     ...   } }': ()
+            36..222 'match ...     }': ()
+            42..47 'tuple': (u8, i16, f32)
+            58..68 '(.., b, c)': (u8, i16, f32)
+            63..64 'b': i16
+            66..67 'c': f32
+            72..74 '{}': ()
+            84..94 '(a, .., c)': (u8, i16, f32)
+            85..86 'a': u8
+            92..93 'c': f32
+            98..100 '{}': ()
+            110..120 '(a, b, ..)': (u8, i16, f32)
+            111..112 'a': u8
+            114..115 'b': i16
+            124..126 '{}': ()
+            136..142 '(a, b)': (u8, i16, f32)
+            137..138 'a': u8
+            140..141 'b': i16
+            146..161 '{/*too short*/}': ()
+            170..182 '(a, b, c, d)': (u8, i16, f32, {unknown})
+            171..172 'a': u8
+            174..175 'b': i16
+            177..178 'c': f32
+            180..181 'd': {unknown}
+            186..200 '{/*too long*/}': ()
+            209..210 '_': (u8, i16, f32)
+            214..216 '{}': ()
+        "#]],
+    );
+}