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test/typeswitch2.go
37 строк
655 B
Matthew Dempsky
cmd/compile: move duplicate type-case checking into typecheck
12 сен 2019, 02:33
12 сен 2019, 02:33
0b739fd
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// 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 "" }