mirror of
https://github.com/golang/go
synced 2024-11-24 04:50:07 -07:00
43 lines
795 B
Go
43 lines
795 B
Go
|
// run
|
||
|
|
|
||
|
|
// Copyright 2016 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.
|
||
|
|
|
||
|
|
// Make sure we don't start marshaling (writing to the stack)
|
||
|
|
// arguments until those arguments are evaluated and known
|
||
|
|
// not to unconditinally panic. If they unconditionally panic,
|
||
|
|
// we write some args but never do the call. That messes up
|
||
|
|
// the logic which decides how big the argout section needs to be.
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
type W interface {
|
||
|
|
Write([]byte)
|
||
|
|
}
|
||
|
|
|
||
|
|
type F func(W)
|
||
|
|
|
||
|
|
func foo(f F) {
|
||
|
|
defer func() {
|
||
|
|
if r := recover(); r != nil {
|
||
|
|
usestack(1000)
|
||
|
|
}
|
||
|
|
}()
|
||
|
|
f(nil)
|
||
|
|
}
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
foo(func(w W) {
|
||
|
|
var x []string
|
||
|
|
w.Write([]byte(x[5]))
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
func usestack(n int) {
|
||
|
|
if n == 0 {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
usestack(n - 1)
|
||
|
|
}
|