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issue43480.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 } }
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