1 files changed, 24 insertions, 0 deletions
diff --git a/test/fixedbugs/issue28926.go b/test/fixedbugs/issue28926.go
new file mode 100644
index 0000000..1ca97d6
--- /dev/null
+++ b/test/fixedbugs/issue28926.go
@@ -0,0 +1,24 @@
+// errorcheck
+
+// Copyright 2018 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.
+
+package main
+
+type Stringer interface {
+	String() string
+}
+
+func main() {
+	var e interface{}
+	switch e := e.(type) {
+	case G: // ERROR "undefined: G|undefined type .*G"
+		e.M() // ok: this error should be ignored because the case failed its typecheck
+	case E: // ERROR "undefined: E|undefined type .*E"
+		e.D() // ok: this error should be ignored because the case failed its typecheck
+	case Stringer:
+		// ok: this error should not be ignored to prove that passing legs aren't left out
+		_ = e.(T) // ERROR "undefined: T|undefined type .*T"
+	}
+}