Fix panic trying to get substs on unknown type

Fixes #585.

2 files changed, 24 insertions, 0 deletions

diff --git a/crates/ra_hir/src/ty/tests.rs b/crates/ra_hir/src/ty/tests.rs
index 5aa24a29b..dc9b626dc 100644
--- a/crates/ra_hir/src/ty/tests.rs
+++ b/crates/ra_hir/src/ty/tests.rs
@@ -521,6 +521,22 @@ fn test(x: X) {
     );
 }
 
+#[test]
+fn bug_585() {
+    check_inference(
+        r#"
+fn test() {
+    X {};
+    match x {
+        A::B {} => (),
+        A::Y() => (),
+    }
+}
+"#,
+        "bug_585.txt",
+    );
+}
+
 fn infer(content: &str) -> String {
     let (db, _, file_id) = MockDatabase::with_single_file(content);
     let source_file = db.source_file(file_id);
diff --git a/crates/ra_hir/src/ty/tests/data/bug_585.txt b/crates/ra_hir/src/ty/tests/data/bug_585.txt
new file mode 100644
index 000000000..627702a38
--- /dev/null
+++ b/crates/ra_hir/src/ty/tests/data/bug_585.txt
@@ -0,0 +1,8 @@
+[11; 89) '{     ...   } }': ()
+[17; 21) 'X {}': [unknown]
+[27; 87) 'match ...     }': ()
+[33; 34) 'x': [unknown]
+[45; 52) 'A::B {}': [unknown]
+[56; 58) '()': ()
+[68; 74) 'A::Y()': [unknown]
+[78; 80) '()': ()