Add regression test

2017-12-23 19:28:13 -08:00 · 2017-12-23 19:28:13 -08:00 · 319ad71b15
parent 5d3ecaebad
commit 319ad71b15
1 changed files with 14 additions and 0 deletions
--- a/tests/cases/conformance/controlFlow/switchWithConstrainedTypeVariable.ts
+++ b/tests/cases/conformance/controlFlow/switchWithConstrainedTypeVariable.ts
@ -0,0 +1,14 @@
+// @strict: true
+
+// Repro from #20840
+
+function function1<T extends 'a' | 'b'>(key: T) {
+  switch (key) {
+    case 'a':
+      key.toLowerCase();
+      break;
+    default:
+      key.toLowerCase();
+      break;
+  }
+}