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// 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 overflow is detected when using numeric constants.
// Does not compile.
package main
import "unsafe"
type I interface{}
const (
// assume all types behave similarly to int8/uint8
Int8 int8 = 101
Minus1 int8 = -1
Uint8 uint8 = 102
Const = 103
Float32 float32 = 104.5
Float64 float64 = 105.5
ConstFloat = 106.5
Big float64 = 1e300
String = "abc"
Bool = true
)
var (
a1 = Int8 * 100 // ERROR "overflow"
a2 = Int8 * -1 // OK
a3 = Int8 * 1000 // ERROR "overflow"
a4 = Int8 * int8(1000) // ERROR "overflow"
a5 = int8(Int8 * 1000) // ERROR "overflow"
a6 = int8(Int8 * int8(1000)) // ERROR "overflow"
a7 = Int8 - 2*Int8 - 2*Int8 // ERROR "overflow"
a8 = Int8 * Const / 100 // ERROR "overflow"
a9 = Int8 * (Const / 100) // OK
b1 = Uint8 * Uint8 // ERROR "overflow"
b2 = Uint8 * -1 // ERROR "overflow"
b3 = Uint8 - Uint8 // OK
b4 = Uint8 - Uint8 - Uint8 // ERROR "overflow"
b5 = uint8(^0) // ERROR "overflow"
b5a = int64(^0) // OK
b6 = ^uint8(0) // OK
b6a = ^int64(0) // OK
b7 = uint8(Minus1) // ERROR "overflow"
b8 = uint8(int8(-1)) // ERROR "overflow"
b8a = uint8(-1) // ERROR "overflow"
b9 byte = (1 << 10) >> 8 // OK
b10 byte = (1 << 10) // ERROR "overflow"
b11 byte = (byte(1) << 10) >> 8 // ERROR "overflow"
b12 byte = 1000 // ERROR "overflow"
b13 byte = byte(1000) // ERROR "overflow"
b14 byte = byte(100) * byte(100) // ERROR "overflow"
b15 byte = byte(100) * 100 // ERROR "overflow"
b16 byte = byte(0) * 1000 // ERROR "overflow"
b16a byte = 0 * 1000 // OK
b17 byte = byte(0) * byte(1000) // ERROR "overflow"
b18 byte = Uint8 / 0 // ERROR "division by zero"
c1 float64 = Big
c2 float64 = Big * Big // ERROR "overflow"
c3 float64 = float64(Big) * Big // ERROR "overflow"
c4 = Big * Big // ERROR "overflow"
c5 = Big / 0 // ERROR "division by zero"
c6 = 1000 % 1e3 // ERROR "invalid operation|expected integer type"
)
func f(int)
func main() {
f(Int8) // ERROR "convert|wrong type|cannot"
f(Minus1) // ERROR "convert|wrong type|cannot"
f(Uint8) // ERROR "convert|wrong type|cannot"
f(Const) // OK
f(Float32) // ERROR "convert|wrong type|cannot"
f(Float64) // ERROR "convert|wrong type|cannot"
f(ConstFloat) // ERROR "truncate"
f(ConstFloat - 0.5) // OK
f(Big) // ERROR "convert|wrong type|cannot"
f(String) // ERROR "convert|wrong type|cannot|incompatible"
f(Bool) // ERROR "convert|wrong type|cannot|incompatible"
}
const ptr = nil // ERROR "const.*nil"
const _ = string([]byte(nil)) // ERROR "is not a? ?constant"
const _ = uintptr(unsafe.Pointer((*int)(nil))) // ERROR "is not a? ?constant"
const _ = unsafe.Pointer((*int)(nil)) // ERROR "cannot be nil|invalid constant type|is not a constant"
const _ = (*int)(nil) // ERROR "cannot be nil|invalid constant type|is not a constant"
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