1// run
2
3// Copyright 2010 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// Test of recover for run-time errors.
8
9// TODO(rsc):
10//	null pointer accesses
11
12package main
13
14import "strings"
15
16var x = make([]byte, 10)
17
18func main() {
19	test1()
20	test2()
21	test3()
22	test4()
23	test5()
24	test6()
25	test7()
26}
27
28func mustRecover(s string) {
29	v := recover()
30	if v == nil {
31		panic("expected panic")
32	}
33	if e := v.(error).Error(); strings.Index(e, s) < 0 {
34		panic("want: " + s + "; have: " + e)
35	}
36}
37
38func test1() {
39	defer mustRecover("index")
40	println(x[123])
41}
42
43func test2() {
44	defer mustRecover("slice")
45	println(x[5:15])
46}
47
48func test3() {
49	defer mustRecover("slice")
50	var lo = 11
51	var hi = 9
52	println(x[lo:hi])
53}
54
55func test4() {
56	defer mustRecover("interface")
57	var x interface{} = 1
58	println(x.(float32))
59}
60
61type T struct {
62	a, b int
63	c    []int
64}
65
66func test5() {
67	defer mustRecover("uncomparable")
68	var x T
69	var z interface{} = x
70	println(z != z)
71}
72
73func test6() {
74	defer mustRecover("unhashable type main.T")
75	var x T
76	var z interface{} = x
77	m := make(map[interface{}]int)
78	m[z] = 1
79}
80
81func test7() {
82	defer mustRecover("divide by zero")
83	var x, y int
84	println(x / y)
85}
86