mirror of
https://github.com/golang/go
synced 2024-11-14 06:50:21 -07:00
a52289ef2b
Numbers without decimals are valid Go representations of whole-number
floats. That is, "var x float64 = 5" is valid Go. Avoid breakage in
tests that expect a certain output from %#v by reverting to it.
To guarantee the right type is generated by a print use %T(%#v) instead.
Added a test to lock in this behavior.
This reverts commit 7c7cecc184.
Fixes #27634
Updates #26363
Change-Id: I544c400a0903777dd216452a7e86dfe60b0b0283
Reviewed-on: https://go-review.googlesource.com/c/142597
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
95 lines
2.2 KiB
Go
95 lines
2.2 KiB
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."
|
|
}
|
|
}
|