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0b739fd4df
Part of the general trend of moving yyerror calls out of walk and into typecheck. Notably, this requires splitting test/typeswitch2.go into two files, because now some of the errors are reported during typecheck and others are still reported during walk; and if there were any errors during typecheck, then cmd/compile exits without invoking walk. Passes toolstash-check. Change-Id: I05ee0c00b99af659ee1eef098d342d0d736cf31e Reviewed-on: https://go-review.googlesource.com/c/go/+/194659 Reviewed-by: Robert Griesemer <gri@golang.org>
37 lines
655 B
Go
37 lines
655 B
Go
// errorcheck
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Verify that various erroneous type switches are caught by the compiler.
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// Does not compile.
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package main
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import "io"
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func whatis(x interface{}) string {
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switch x.(type) {
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case int:
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return "int"
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case int: // ERROR "duplicate"
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return "int8"
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case io.Reader:
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return "Reader1"
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case io.Reader: // ERROR "duplicate"
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return "Reader2"
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case interface {
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r()
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w()
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}:
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return "rw"
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case interface { // ERROR "duplicate"
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w()
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r()
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}:
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return "wr"
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}
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return ""
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}
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