1// errorcheck
2
3// Copyright 2009 The Go Authors. All rights reserved.
4// Use of this source code is governed by a BSD-style
5// license that can be found in the LICENSE file.
6
7// Verify that large integer constant expressions cause overflow.
8// Does not compile.
9
10package main
11
12const (
13	A int = 1
14	B byte;	// ERROR "type without expr|expected .=.|missing init expr"
15)
16
17const LargeA = 1000000000000000000
18const LargeB = LargeA * LargeA * LargeA
19const LargeC = LargeB * LargeB * LargeB // GC_ERROR "constant multiplication overflow"
20
21const AlsoLargeA = LargeA << 400 << 400 >> 400 >> 400 // GC_ERROR "constant shift overflow"
22
23// Issue #42732.
24
25const a = 1e+500000000
26const b = a * a // ERROR "constant multiplication overflow|not representable"
27const c = b * b
28
29const MaxInt512 = (1<<256 - 1) * (1<<256 + 1)
30const _ = MaxInt512 + 1  // ERROR "constant addition overflow"
31const _ = MaxInt512 ^ -1 // ERROR "constant bitwise XOR overflow"
32const _ = ^MaxInt512     // ERROR "constant bitwise complement overflow"
33