mirror of
https://github.com/golang/go
synced 2024-11-15 03:10:22 -07:00
290b4154b7
It's an error to call Int64Val on constants that don't fit into int64. CL 272654 made the compiler stricter about detecting misuse, and revealed that we were using it improperly in detecting consecutive integer-switch cases. That particular usage actually did work in practice, but it's easy and best to just fix it. Fixes #43480. Change-Id: I56f722d75e83091638ac43b80e45df0b0ad7d48d Reviewed-on: https://go-review.googlesource.com/c/go/+/281272 Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
34 lines
626 B
Go
34 lines
626 B
Go
// run
|
|
|
|
// 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.
|
|
|
|
// Issue #43480: ICE on large uint64 constants in switch cases.
|
|
|
|
package main
|
|
|
|
func isPow10(x uint64) bool {
|
|
switch x {
|
|
case 1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
|
|
1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19:
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func main() {
|
|
var x uint64 = 1
|
|
|
|
for {
|
|
if !isPow10(x) || isPow10(x-1) || isPow10(x+1) {
|
|
panic(x)
|
|
}
|
|
next := x * 10
|
|
if next/10 != x {
|
|
break // overflow
|
|
}
|
|
x = next
|
|
}
|
|
}
|