go switch5 源码
golang switch5 代码
文件路径：/test/switch5.go
// 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
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 (int.0. .value 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\(10\) .value 10. in switch)?"
case float64(10):
case float64(10): // ERROR "duplicate case (float64\(10\) .value 10. in switch)?"
}
}
func f5(a [1]int) {
switch a {
case [1]int{0}:
case [1]int{0}: // OK -- see issue 15896
}
}
// Ensure duplicate const bool clauses are accepted.
func f6() int {
switch {
case 0 == 0:
return 0
case 1 == 1: // Intentionally OK, even though a duplicate of the above const true
return 1
}
return 2
}
// Ensure duplicates in ranges are detected (issue #17517).
func f7(a int) {
switch a {
case 0:
case 0, 1: // ERROR "duplicate case 0"
case 1, 2, 3, 4: // ERROR "duplicate case 1"
}
}
// Ensure duplicates with simple literals are printed as they were
// written, not just their values. Particularly useful for runes.
func f8(r rune) {
const x = 10
switch r {
case 33, 33: // ERROR "duplicate case (33 in switch)?"
case 34, '"': // ERROR "duplicate case '"' .value 34. in switch"
case 35, rune('#'): // ERROR "duplicate case (rune.'#'. .value 35. in switch)?"
case 36, rune(36): // ERROR "duplicate case (rune.36. .value 36. in switch)?"
case 37, '$'+1: // ERROR "duplicate case ('\$' \+ 1 .value 37. in switch)?"
case 'b':
case 'a', 'b', 'c', 'd': // ERROR "duplicate case ('b' .value 98.)?"
case x, x: // ERROR "duplicate case (x .value 10.)?"
}
}
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