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-rw-r--r--test/switch7.go35
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+// errorcheck
+
+// Copyright 2016 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.
+
+// Verify that type switch statements with duplicate cases are detected
+// by the compiler.
+// Does not compile.
+
+package main
+
+import "fmt"
+
+func f4(e interface{}) {
+ switch e.(type) {
+ case int:
+ case int: // ERROR "duplicate case int in type switch"
+ case int64:
+ case error:
+ case error: // ERROR "duplicate case error in type switch"
+ case fmt.Stringer:
+ case fmt.Stringer: // ERROR "duplicate case fmt.Stringer in type switch"
+ case struct {
+ i int "tag1"
+ }:
+ case struct {
+ i int "tag2"
+ }:
+ case struct { // ERROR "duplicate case struct { i int .tag1. } in type switch"
+ i int "tag1"
+ }:
+ }
+}
+