golang issue39472 代码
文件路径：/test/fixedbugs/issue39472.go
/ compile -N
/ Copyright 2020 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 p
func f(x float64) bool {
x += 1
return (x != 0) == (x != 0)
}