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34 lines
626 B
Go
34 lines
626 B
Go
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// run
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// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Issue #43480: ICE on large uint64 constants in switch cases.
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package main
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func isPow10(x uint64) bool {
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switch x {
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case 1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
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1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19:
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return true
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}
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return false
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}
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func main() {
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var x uint64 = 1
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for {
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if !isPow10(x) || isPow10(x-1) || isPow10(x+1) {
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panic(x)
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}
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next := x * 10
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if next/10 != x {
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break // overflow
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}
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x = next
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}
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}
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