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-rw-r--r--test/fixedbugs/issue12621.go20
1 files changed, 20 insertions, 0 deletions
diff --git a/test/fixedbugs/issue12621.go b/test/fixedbugs/issue12621.go
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index 0000000..379a362
--- /dev/null
+++ b/test/fixedbugs/issue12621.go
@@ -0,0 +1,20 @@
+// run
+
+// Copyright 2018 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.
+
+// Issues 12576 and 12621: Negative untyped floating point constants
+// with small magnitude round to 0, not negative zero.
+
+package main
+
+import "math"
+
+var m = -1e-10000
+
+func main() {
+ if math.Signbit(m) {
+ panic(m)
+ }
+}