mirror of
https://github.com/golang/go
synced 2024-11-23 16:30:06 -07:00
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>
38 lines
655 B
Go
38 lines
655 B
Go
// 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 ""
|
|
}
|