go recover2 源码
golang recover2 代码
文件路径：/test/recover2.go
// run
// Copyright 2010 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.
// Test of recover for run-time errors.
// TODO(rsc):
// null pointer accesses
package main
import "strings"
var x = make([]byte, 10)
func main() {
test1()
test2()
test3()
test4()
test5()
test6()
test7()
}
func mustRecover(s string) {
v := recover()
if v == nil {
panic("expected panic")
}
if e := v.(error).Error(); strings.Index(e, s) < 0 {
panic("want: " + s + "; have: " + e)
}
}
func test1() {
defer mustRecover("index")
println(x[123])
}
func test2() {
defer mustRecover("slice")
println(x[5:15])
}
func test3() {
defer mustRecover("slice")
var lo = 11
var hi = 9
println(x[lo:hi])
}
func test4() {
defer mustRecover("interface")
var x interface{} = 1
println(x.(float32))
}
type T struct {
a, b int
c []int
}
func test5() {
defer mustRecover("uncomparable")
var x T
var z interface{} = x
println(z != z)
}
func test6() {
defer mustRecover("unhashable type main.T")
var x T
var z interface{} = x
m := make(map[interface{}]int)
m[z] = 1
}
func test7() {
defer mustRecover("divide by zero")
var x, y int
println(x / y)
}
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