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-rw-r--r--test/fixedbugs/issue43480.go33
1 files changed, 33 insertions, 0 deletions
diff --git a/test/fixedbugs/issue43480.go b/test/fixedbugs/issue43480.go
new file mode 100644
index 0000000..d98ad3a
--- /dev/null
+++ b/test/fixedbugs/issue43480.go
@@ -0,0 +1,33 @@
+// 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
+ }
+}