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73 lines
1.2 KiB
73 lines
1.2 KiB
4 months ago
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// errorcheck
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// Copyright 2011 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 erroneous switch statements are detected by the compiler.
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// Does not compile.
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package main
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type I interface {
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M()
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}
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func bad() {
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var i I
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var s string
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switch i {
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case s: // ERROR "mismatched types string and I|incompatible types"
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}
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switch s {
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case i: // ERROR "mismatched types I and string|incompatible types"
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}
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var m, m1 map[int]int
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switch m {
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case nil:
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case m1: // ERROR "can only compare map m to nil|map can only be compared to nil"
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default:
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}
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var a, a1 []int
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switch a {
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case nil:
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case a1: // ERROR "can only compare slice a to nil|slice can only be compared to nil"
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default:
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}
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var f, f1 func()
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switch f {
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case nil:
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case f1: // ERROR "can only compare func f to nil|func can only be compared to nil"
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default:
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}
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var ar, ar1 [4]func()
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switch ar { // ERROR "cannot switch on"
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case ar1:
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default:
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}
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var st, st1 struct{ f func() }
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switch st { // ERROR "cannot switch on"
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case st1:
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}
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}
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func good() {
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var i interface{}
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var s string
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switch i {
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case s:
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}
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switch s {
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case i:
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}
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}
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