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 overflow is detected when using numeric constants. 8// Does not compile. 9 10package main 11 12type I interface{} 13 14const ( 15 // assume all types behave similarly to int8/uint8 16 Int8 int8 = 101 17 Minus1 int8 = -1 18 Uint8 uint8 = 102 19 Const = 103 20 21 Float32 float32 = 104.5 22 Float64 float64 = 105.5 23 ConstFloat = 106.5 24 Big float64 = 1e300 25 26 String = "abc" 27 Bool = true 28) 29 30var ( 31 a1 = Int8 * 100 // ERROR "overflow" 32 a2 = Int8 * -1 // OK 33 a3 = Int8 * 1000 // ERROR "overflow" 34 a4 = Int8 * int8(1000) // ERROR "overflow" 35 a5 = int8(Int8 * 1000) // ERROR "overflow" 36 a6 = int8(Int8 * int8(1000)) // ERROR "overflow" 37 a7 = Int8 - 2*Int8 - 2*Int8 // ERROR "overflow" 38 a8 = Int8 * Const / 100 // ERROR "overflow" 39 a9 = Int8 * (Const / 100) // OK 40 41 b1 = Uint8 * Uint8 // ERROR "overflow" 42 b2 = Uint8 * -1 // ERROR "overflow" 43 b3 = Uint8 - Uint8 // OK 44 b4 = Uint8 - Uint8 - Uint8 // ERROR "overflow" 45 b5 = uint8(^0) // ERROR "overflow" 46 b5a = int64(^0) // OK 47 b6 = ^uint8(0) // OK 48 b6a = ^int64(0) // OK 49 b7 = uint8(Minus1) // ERROR "overflow" 50 b8 = uint8(int8(-1)) // ERROR "overflow" 51 b8a = uint8(-1) // ERROR "overflow" 52 b9 byte = (1 << 10) >> 8 // OK 53 b10 byte = (1 << 10) // ERROR "overflow" 54 b11 byte = (byte(1) << 10) >> 8 // ERROR "overflow" 55 b12 byte = 1000 // ERROR "overflow" 56 b13 byte = byte(1000) // ERROR "overflow" 57 b14 byte = byte(100) * byte(100) // ERROR "overflow" 58 b15 byte = byte(100) * 100 // ERROR "overflow" 59 b16 byte = byte(0) * 1000 // ERROR "overflow" 60 b16a byte = 0 * 1000 // OK 61 b17 byte = byte(0) * byte(1000) // ERROR "overflow" 62 b18 byte = Uint8 / 0 // ERROR "division by zero" 63 64 c1 float64 = Big 65 c2 float64 = Big * Big // ERROR "overflow" 66 c3 float64 = float64(Big) * Big // ERROR "overflow" 67 c4 = Big * Big // ERROR "overflow" 68 c5 = Big / 0 // ERROR "division by zero" 69 c6 = 1000 % 1e3 // ERROR "floating-point % operation|expected integer type" 70) 71 72func f(int) 73 74func main() { 75 f(Int8) // ERROR "convert|wrong type|cannot" 76 f(Minus1) // ERROR "convert|wrong type|cannot" 77 f(Uint8) // ERROR "convert|wrong type|cannot" 78 f(Const) // OK 79 f(Float32) // ERROR "convert|wrong type|cannot" 80 f(Float64) // ERROR "convert|wrong type|cannot" 81 f(ConstFloat) // ERROR "truncate" 82 f(ConstFloat - 0.5) // OK 83 f(Big) // ERROR "convert|wrong type|cannot" 84 f(String) // ERROR "convert|wrong type|cannot|incompatible" 85 f(Bool) // ERROR "convert|wrong type|cannot|incompatible" 86} 87 88const ptr = nil // ERROR "const.*nil" 89