mirror of
https://github.com/golang/go
synced 2024-11-05 15:46:11 -07:00
61 lines
1.2 KiB
Go
61 lines
1.2 KiB
Go
|
// run
|
||
|
|
|
||
|
|
// Copyright 2019 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.
|
||
|
|
|
||
|
|
// short-circuiting interface-to-concrete comparisons
|
||
|
|
// will not miss panics
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"log"
|
||
|
|
"strings"
|
||
|
|
)
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
var (
|
||
|
|
x interface{}
|
||
|
|
p *int
|
||
|
|
s []int
|
||
|
|
l *interface{}
|
||
|
|
r []*int
|
||
|
|
)
|
||
|
|
tests := []struct {
|
||
|
|
name string
|
||
|
|
errStr string
|
||
|
|
f func()
|
||
|
|
}{
|
||
|
|
{"switch case", "", func() {
|
||
|
|
switch x {
|
||
|
|
case x.(*int):
|
||
|
|
}
|
||
|
|
}},
|
||
|
|
{"interface conversion", "", func() { _ = x == x.(error) }},
|
||
|
|
{"type assertion", "", func() { _ = x == x.(*int) }},
|
||
|
|
{"out of bounds", "", func() { _ = x == s[1] }},
|
||
|
|
{"nil pointer dereference #1", "", func() { _ = x == *p }},
|
||
|
|
{"nil pointer dereference #2", "nil pointer dereference", func() { _ = *l == r[0] }},
|
||
|
|
}
|
||
|
|
|
||
|
|
for _, tc := range tests {
|
||
|
|
testFuncShouldPanic(tc.name, tc.errStr, tc.f)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func testFuncShouldPanic(name, errStr string, f func()) {
|
||
|
|
defer func() {
|
||
|
|
e := recover()
|
||
|
|
if e == nil {
|
||
|
|
log.Fatalf("%s: comparison did not panic\n", name)
|
||
|
|
}
|
||
|
|
if errStr != "" {
|
||
|
|
if !strings.Contains(e.(error).Error(), errStr) {
|
||
|
|
log.Fatalf("%s: wrong panic message\n", name)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}()
|
||
|
|
f()
|
||
|
|
}
|