Commit 8003e791 authored by Josh Bleecher Snyder's avatar Josh Bleecher Snyder

test: add more switch error handling tests

Some of these errors are reported in the wrong places.
That’s issue #15911 and #15912.

Change-Id: Ia09d7f89be4d15f05217a542a61b6ac08090dd87
Reviewed-on: https://go-review.googlesource.com/23588
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: default avatarKeith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
parent 1846c632
// 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.
// Verify that switch statements with duplicate cases are detected by the compiler.
// Does not compile.
package main
import "fmt"
func f0(x int) {
switch x {
case 0:
case 0: // ERROR "duplicate case 0 in switch"
}
switch x {
case 0:
case int(0): // ERROR "duplicate case 0 in switch"
}
}
func f1(x float32) {
switch x {
case 5:
case 5: // ERROR "duplicate case 5 in switch"
case 5.0: // ERROR "duplicate case 5 in switch"
}
}
func f2(s string) {
switch s {
case "":
case "": // ERROR "duplicate case .. in switch"
case "abc":
case "abc": // ERROR "duplicate case .abc. in switch"
}
}
func f3(e interface{}) {
switch e {
case 0:
case 0: // ERROR "duplicate case 0 in switch"
case int64(0):
case float32(10):
case float32(10): // ERROR "duplicate case float32\(10\) in switch"
case float64(10):
case float64(10): // ERROR "duplicate case float64\(10\) in switch"
}
}
func f4(e interface{}) {
switch e.(type) {
case int:
case int: // ERROR "duplicate case int in type switch"
case int64:
case error: // ERROR "duplicate case error in type switch"
case error:
case fmt.Stringer:
case fmt.Stringer: // ERROR "duplicate case fmt.Stringer in type switch"
case struct {
i int "tag1"
}:
case struct {
i int "tag2"
}:
case struct {
i int "tag1"
}: // ERROR "duplicate case struct { i int .tag1. } in type switch"
}
}
func f5(a [1]int) {
switch a {
case [1]int{0}:
case [1]int{0}: // OK -- see issue 15896
}
}
// 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: e \(type error\) cannot have dynamic type int \(missing Error method\)"
}
}
// Verify that the compiler rejects multiple default cases.
func f1(e interface{}) {
switch e { // ERROR "multiple defaults in switch"
default:
default:
}
switch e.(type) { // ERROR "multiple defaults in switch"
default:
default:
}
}
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