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Filename : issue12621.go

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// 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)
	}
}