1// errorcheck
2
3// Copyright 2016 The Go Authors. All rights reserved.
4// Use of this source code is governed by a BSD-style
5// license that can be found in the LICENSE file.
6
7// Verify that type switch statements with duplicate cases are detected
8// by the compiler.
9// Does not compile.
10
11package main
12
13import "fmt"
14
15func f4(e interface{}) {
16	switch e.(type) {
17	case int:
18	case int: // ERROR "duplicate case int in type switch"
19	case int64:
20	case error:
21	case error: // ERROR "duplicate case error in type switch"
22	case fmt.Stringer:
23	case fmt.Stringer: // ERROR "duplicate case fmt.Stringer in type switch"
24	case struct {
25		i int "tag1"
26	}:
27	case struct {
28		i int "tag2"
29	}:
30	case struct { // ERROR "duplicate case struct { i int .tag1. } in type switch|duplicate case"
31		i int "tag1"
32	}:
33	}
34}
35
36