| 1 | // Copyright 2022 The Go Authors. All rights reserved. |
|---|---|
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | // Test conversion operations. |
| 6 | |
| 7 | package main |
| 8 | |
| 9 | func left(x int) { _ = 1 << x } |
| 10 | func right(x int) { _ = 1 >> x } |
| 11 | |
| 12 | func main() { |
| 13 | wantPanic( |
| 14 | func() { |
| 15 | left(-1) |
| 16 | }, |
| 17 | "runtime error: negative shift amount", |
| 18 | ) |
| 19 | wantPanic( |
| 20 | func() { |
| 21 | right(-1) |
| 22 | }, |
| 23 | "runtime error: negative shift amount", |
| 24 | ) |
| 25 | wantPanic( |
| 26 | func() { |
| 27 | const maxInt32 = 1<<31 - 1 |
| 28 | var idx int64 = maxInt32*2 + 8 |
| 29 | x := make([]int, 16) |
| 30 | _ = x[idx] |
| 31 | }, |
| 32 | "runtime error: runtime error: index out of range [4294967302] with length 16", |
| 33 | ) |
| 34 | } |
| 35 | |
| 36 | func wantPanic(fn func(), s string) { |
| 37 | defer func() { |
| 38 | err := recover() |
| 39 | if err == nil { |
| 40 | panic("expected panic") |
| 41 | } |
| 42 | if got := err.(error).Error(); got != s { |
| 43 | panic("expected panic " + s + " got " + got) |
| 44 | } |
| 45 | }() |
| 46 | fn() |
| 47 | } |
| 48 |
Members