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95 lines
2.2 KiB
95 lines
2.2 KiB
4 months ago
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// 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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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 int.0. .value 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\(10\) .value 10. in switch"
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case float64(10):
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case float64(10): // ERROR "duplicate case float64\(10\) .value 10. in 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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// Ensure duplicate const bool clauses are accepted.
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func f6() int {
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switch {
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case 0 == 0:
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return 0
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case 1 == 1: // Intentionally OK, even though a duplicate of the above const true
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return 1
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}
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return 2
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}
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// Ensure duplicates in ranges are detected (issue #17517).
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func f7(a int) {
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switch a {
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case 0:
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case 0, 1: // ERROR "duplicate case 0"
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case 1, 2, 3, 4: // ERROR "duplicate case 1"
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}
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}
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// Ensure duplicates with simple literals are printed as they were
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// written, not just their values. Particularly useful for runes.
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func f8(r rune) {
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const x = 10
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switch r {
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case 33, 33: // ERROR "duplicate case 33 in switch"
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case 34, '"': // ERROR "duplicate case '"' .value 34. in switch"
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case 35, rune('#'): // ERROR "duplicate case rune.'#'. .value 35. in switch"
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case 36, rune(36): // ERROR "duplicate case rune.36. .value 36. in switch"
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case 37, '$'+1: // ERROR "duplicate case '\$' \+ 1 .value 37. in switch"
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case 'b':
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case 'a', 'b', 'c', 'd': // ERROR "duplicate case 'b' .value 98."
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case x, x: // ERROR "duplicate case x .value 10."
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}
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}
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