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Source file test/fixedbugs/issue4388.go

Documentation: test/fixedbugs

  // run
  
  // Copyright 2014 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.
  
  package main
  
  import (
  	"fmt"
  	"io"
  	"runtime"
  )
  
  type T struct {
  	io.Closer
  }
  
  func f1() {
  	// The 5 here and below depends on the number of internal runtime frames
  	// that sit between a deferred function called during panic and
  	// the original frame. If that changes, this test will start failing and
  	// the number here will need to be updated.
  	defer checkLine(5)
  	var t *T
  	var c io.Closer = t
  	c.Close()
  }
  
  func f2() {
  	defer checkLine(5)
  	var t T
  	var c io.Closer = t
  	c.Close()
  }
  
  func main() {
  	f1()
  	f2()
  }
  
  func checkLine(n int) {
  	if err := recover(); err == nil {
  		panic("did not panic")
  	}
  	var file string
  	var line int
  	for i := 1; i <= n; i++ {
  		_, file, line, _ = runtime.Caller(i)
  		if file != "<autogenerated>" || line != 1 {
  			continue
  		}
  		return
  	}
  	panic(fmt.Sprintf("expected <autogenerated>:1 have %s:%d", file, line))
  }
  

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