3 // Copyright 2016 The Go Authors. All rights reserved.
4 // Use of this source code is governed by a BSD-style
5 // license that can be found in the LICENSE file.
7 // Verify that switch statements with duplicate cases are detected by the compiler.
15 case 0: // ERROR "duplicate case 0 in switch"
20 case int(0): // ERROR "duplicate case int.0. .value 0. in switch"
27 case 5: // ERROR "duplicate case 5 .value 5\.0. in switch"
28 case 5.0: // ERROR "duplicate case 5 .value 5\.0. in switch"
35 case "": // ERROR "duplicate case .. in switch"
37 case "abc": // ERROR "duplicate case .abc. in switch"
41 func f3(e interface{}) {
44 case 0: // ERROR "duplicate case 0 in switch"
47 case float32(10): // ERROR "duplicate case float32\(10\) .value 10\.0. in switch"
49 case float64(10): // ERROR "duplicate case float64\(10\) .value 10\.0. in switch"
56 case [1]int{0}: // OK -- see issue 15896
60 // Ensure duplicate const bool clauses are accepted.
65 case 1 == 1: // Intentionally OK, even though a duplicate of the above const true
71 // Ensure duplicates in ranges are detected (issue #17517).
75 case 0, 1: // ERROR "duplicate case 0"
76 case 1, 2, 3, 4: // ERROR "duplicate case 1"
80 // Ensure duplicates with simple literals are printed as they were
81 // written, not just their values. Particularly useful for runes.
85 case 33, 33: // ERROR "duplicate case 33 in switch"
86 case 34, '"': // ERROR "duplicate case '"' .value 34. in switch"
87 case 35, rune('#'): // ERROR "duplicate case rune.'#'. .value 35. in switch"
88 case 36, rune(36): // ERROR "duplicate case rune.36. .value 36. in switch"
89 case 37, '$'+1: // ERROR "duplicate case '\$' \+ 1 .value 37. in switch"
91 case 'a', 'b', 'c', 'd': // ERROR "duplicate case 'b' .value 98."
92 case x, x: // ERROR "duplicate case x .value 10."