1 files changed, 29 insertions, 0 deletions
diff --git a/test/fixedbugs/issue28085.go b/test/fixedbugs/issue28085.go
new file mode 100644
index 0000000..01fffd5
--- /dev/null
+++ b/test/fixedbugs/issue28085.go
@@ -0,0 +1,29 @@
+// 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 p
+
+var _ = map[interface{}]int{
+	0: 0,
+	0: 0, // ERROR "duplicate"
+}
+
+var _ = map[interface{}]int{
+	interface{}(0): 0,
+	interface{}(0): 0, // ok
+}
+
+func _() {
+	switch interface{}(0) {
+	case 0:
+	case 0: // ERROR "duplicate"
+	}
+
+	switch interface{}(0) {
+	case interface{}(0):
+	case interface{}(0): // ok
+	}
+}