| // 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) |
| } |
