mirror of
https://github.com/golang/go
synced 2024-11-23 06:10:05 -07:00
1a3006b035
Change-Id: If443ffb50b140c466dcf4cc5340f44948bfa46a9 Reviewed-on: https://go-review.googlesource.com/26765 Reviewed-by: Matthew Dempsky <mdempsky@google.com>
83 lines
1.0 KiB
Go
83 lines
1.0 KiB
Go
// Copyright 2015 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.
|
|
|
|
package main
|
|
|
|
func fail() // unimplemented, to test dead code elimination
|
|
|
|
// Test dead code elimination in if statements
|
|
func init() {
|
|
if false {
|
|
fail()
|
|
}
|
|
if 0 == 1 {
|
|
fail()
|
|
}
|
|
}
|
|
|
|
// Test dead code elimination in ordinary switch statements
|
|
func init() {
|
|
const x = 0
|
|
switch x {
|
|
case 1:
|
|
fail()
|
|
}
|
|
|
|
switch 1 {
|
|
case x:
|
|
fail()
|
|
}
|
|
|
|
switch {
|
|
case false:
|
|
fail()
|
|
}
|
|
|
|
const a = "a"
|
|
switch a {
|
|
case "b":
|
|
fail()
|
|
}
|
|
|
|
const snowman = '☃'
|
|
switch snowman {
|
|
case '☀':
|
|
fail()
|
|
}
|
|
|
|
const zero = float64(0.0)
|
|
const one = float64(1.0)
|
|
switch one {
|
|
case -1.0:
|
|
fail()
|
|
case zero:
|
|
fail()
|
|
}
|
|
|
|
switch 1.0i {
|
|
case 1:
|
|
fail()
|
|
case -1i:
|
|
fail()
|
|
}
|
|
|
|
const no = false
|
|
switch no {
|
|
case true:
|
|
fail()
|
|
}
|
|
|
|
// Test dead code elimination in large ranges.
|
|
switch 5 {
|
|
case 3, 4, 5, 6, 7:
|
|
case 0, 1, 2:
|
|
fail()
|
|
default:
|
|
fail()
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
}
|