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// errorcheck
// Copyright 2016 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.
// Check the compiler's switch handling that happens
// at typechecking time.
// This must be separate from other checks,
// because errors during typechecking
// prevent other errors from being discovered.
package main
// Verify that type switch statements with impossible cases are detected by the compiler.
func f0(e error) {
switch e.(type) {
case int: // ERROR "impossible type switch case: (int\n\t)?e \(.*type error\) cannot have dynamic type int \(missing method Error\)"
}
}
// Verify that the compiler rejects multiple default cases.
func f1(e interface{}) {
switch e {
default:
default: // ERROR "multiple defaults( in switch)?"
}
switch e.(type) {
default:
default: // ERROR "multiple defaults( in switch)?"
}
}
type I interface {
Foo()
}
type X int
func (*X) Foo() {}
func f2() {
var i I
switch i.(type) {
case X: // ERROR "impossible type switch case: (X\n\t)?i \(.*type I\) cannot have dynamic type X \(method Foo has pointer receiver\)"
}
}
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