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go/test/fixedbugs/issue11326.go
Russ Cox 1122836b5f cmd/compile: reject large floating point exponents without math/big
For #11326 (but not a fix).

Change-Id: Ic51814f5cd7357427c3fd990a5522775d05e7987
Reviewed-on: https://go-review.googlesource.com/11673
Reviewed-by: Robert Griesemer <gri@golang.org>
2015-06-29 21:18:01 +00:00

29 lines
1.2 KiB
Go

// errorcheck
// Copyright 2015 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.
package main
import "fmt"
func main() {
var g = 1e81391777742999 // ERROR "exponent too large"
// The next should only cause a problem when converted to float64
// by the assignment, but instead the compiler rejects it outright,
// rather than mishandle it. Specifically, when handled, 'var h' prints:
// issue11326.go:N: constant 0.93342e+536870911 overflows float64
// The rejection of 'var i' is just insurance. It seems to work correctly.
// See golang.org/issue/11326.
// var h = 1e2147483647 // should be "1.00000e+2147483647 overflows float64"
var h = 1e2147483647 // ERROR "exponent too large"
// var i = 1e214748364 // should be "1.00000e\+214748364 overflows float64"
var i = 1e214748364 // ERROR "exponent too large"
var j = 1e21474836 // ERROR "1.00000e\+21474836 overflows float64"
var k = 1e2147483 // ERROR "1.00000e\+2147483 overflows float64"
var l = 1e214748 // ERROR "1.00000e\+214748 overflows float64"
var m = 1e21474 // ERROR "1.00000e\+21474 overflows float64"
fmt.Println(g)
}