go switch3 源码
golang switch3 代码
文件路径：/test/switch3.go
// 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|cannot compare"
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|cannot compare"
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|cannot compare"
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:
}
}
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