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Diffstat (limited to 'test/typeswitch2.go')
-rw-r--r-- | test/typeswitch2.go | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/test/typeswitch2.go b/test/typeswitch2.go new file mode 100644 index 0000000..62c96c8 --- /dev/null +++ b/test/typeswitch2.go @@ -0,0 +1,37 @@ +// errorcheck + +// Copyright 2009 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 various erroneous type switches are caught by the compiler. +// Does not compile. + +package main + +import "io" + +func whatis(x interface{}) string { + switch x.(type) { + case int: + return "int" + case int: // ERROR "duplicate" + return "int8" + case io.Reader: + return "Reader1" + case io.Reader: // ERROR "duplicate" + return "Reader2" + case interface { + r() + w() + }: + return "rw" + case interface { // ERROR "duplicate" + w() + r() + }: + return "wr" + + } + return "" +} |