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-rw-r--r--test/switch3.go72
1 files changed, 72 insertions, 0 deletions
diff --git a/test/switch3.go b/test/switch3.go
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@@ -0,0 +1,72 @@
+// errorcheck
+
+// Copyright 2011 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 erroneous switch statements are detected by the compiler.
+// Does not compile.
+
+package main
+
+type I interface {
+ M()
+}
+
+func bad() {
+ var i I
+ var s string
+
+ switch i {
+ case s: // ERROR "mismatched types string and I|incompatible types"
+ }
+
+ switch s {
+ case i: // ERROR "mismatched types I and string|incompatible types"
+ }
+
+ var m, m1 map[int]int
+ switch m {
+ case nil:
+ case m1: // ERROR "can only compare map m to nil|map can only be compared to nil"
+ default:
+ }
+
+ var a, a1 []int
+ switch a {
+ case nil:
+ case a1: // ERROR "can only compare slice a to nil|slice can only be compared to nil"
+ default:
+ }
+
+ var f, f1 func()
+ switch f {
+ case nil:
+ case f1: // ERROR "can only compare func f to nil|func can only be compared to nil"
+ default:
+ }
+
+ var ar, ar1 [4]func()
+ switch ar { // ERROR "cannot switch on"
+ case ar1:
+ default:
+ }
+
+ var st, st1 struct{ f func() }
+ switch st { // ERROR "cannot switch on"
+ case st1:
+ }
+}
+
+func good() {
+ var i interface{}
+ var s string
+
+ switch i {
+ case s:
+ }
+
+ switch s {
+ case i:
+ }
+}