1 files changed, 17 insertions, 0 deletions
diff --git a/test/fixedbugs/issue21988.go b/test/fixedbugs/issue21988.go
new file mode 100644
index 0000000..4dbf06e
--- /dev/null
+++ b/test/fixedbugs/issue21988.go
@@ -0,0 +1,17 @@
+// errorcheck
+
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Issue 21988: panic on switch case with invalid value
+
+package p
+
+const X = Wrong(0) // ERROR "undefined: Wrong|undefined name .*Wrong"
+
+func _() {
+	switch 0 {
+	case X:
+	}
+}