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bd2838be77
This is a bit simpler than playing sorting games, and it is clearer that it generates errors in the correct (source) order. It also allows us to simplify sorting. It also prevents quadratic error messages for (pathological) inputs with many duplicate type cases. While we’re here, refactoring deduping into separate functions. Negligible compilebench impact. Fixes #15912. Change-Id: I6cc19edd38875389a70ccbdbdf0d9b7d5ac5946f Reviewed-on: https://go-review.googlesource.com/26762 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
82 lines
1.6 KiB
Go
82 lines
1.6 KiB
Go
// errorcheck
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// Copyright 2016 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 switch statements with duplicate cases are detected by the compiler.
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// Does not compile.
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package main
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import "fmt"
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func f0(x int) {
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switch x {
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case 0:
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case 0: // ERROR "duplicate case 0 in switch"
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}
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switch x {
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case 0:
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case int(0): // ERROR "duplicate case 0 in switch"
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}
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}
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func f1(x float32) {
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switch x {
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case 5:
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case 5: // ERROR "duplicate case 5 in switch"
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case 5.0: // ERROR "duplicate case 5 in switch"
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}
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}
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func f2(s string) {
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switch s {
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case "":
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case "": // ERROR "duplicate case .. in switch"
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case "abc":
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case "abc": // ERROR "duplicate case .abc. in switch"
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}
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}
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func f3(e interface{}) {
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switch e {
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case 0:
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case 0: // ERROR "duplicate case 0 in switch"
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case int64(0):
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case float32(10):
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case float32(10): // ERROR "duplicate case float32\(10\) in switch"
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case float64(10):
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case float64(10): // ERROR "duplicate case float64\(10\) in switch"
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}
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}
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func f4(e interface{}) {
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switch e.(type) {
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case int:
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case int: // ERROR "duplicate case int in type switch"
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case int64:
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case error:
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case error: // ERROR "duplicate case error in type switch"
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case fmt.Stringer:
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case fmt.Stringer: // ERROR "duplicate case fmt.Stringer in type switch"
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case struct {
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i int "tag1"
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}:
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case struct {
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i int "tag2"
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}:
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case struct {
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i int "tag1"
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}: // ERROR "duplicate case struct { i int .tag1. } in type switch"
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}
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}
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func f5(a [1]int) {
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switch a {
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case [1]int{0}:
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case [1]int{0}: // OK -- see issue 15896
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}
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}
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