go const2 源码
golang const2 代码
文件路径：/test/const2.go
// errorcheck
// Copyright 2009 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.
// Verify that large integer constant expressions cause overflow.
// Does not compile.
package main
const (
A int = 1
B byte; // ERROR "type without expr|expected .=.|missing init expr"
)
const LargeA = 1000000000000000000
const LargeB = LargeA * LargeA * LargeA
const LargeC = LargeB * LargeB * LargeB // GC_ERROR "constant multiplication overflow"
const AlsoLargeA = LargeA << 400 << 400 >> 400 >> 400 // GC_ERROR "constant shift overflow"
// Issue #42732.
const a = 1e+500000000
const b = a * a // ERROR "constant multiplication overflow|not representable"
const c = b * b
const MaxInt512 = (1<<256 - 1) * (1<<256 + 1)
const _ = MaxInt512 + 1 // ERROR "constant addition overflow"
const _ = MaxInt512 ^ -1 // ERROR "constant bitwise XOR overflow"
const _ = ^MaxInt512 // ERROR "constant bitwise complement overflow"
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