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Source file test/fixedbugs/issue17318.go

Documentation: test/fixedbugs

  // errorcheck -0 -N -m -l
  
  // 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.
  
  // The escape analyzer needs to run till its root set settles
  // (this is not that often, it turns out).
  // This test is likely to become stale because the leak depends
  // on a spurious-escape bug -- return an interface as a named
  // output parameter appears to cause the called closure to escape,
  // where returning it as a regular type does not.
  
  package main
  
  import (
  	"fmt"
  )
  
  type closure func(i, j int) ent
  
  type ent int
  
  func (e ent) String() string {
  	return fmt.Sprintf("%d", int(e)) // ERROR "ent.String ... argument does not escape$" "int\(e\) escapes to heap$"
  }
  
  //go:noinline
  func foo(ops closure, j int) (err fmt.Stringer) { // ERROR "leaking param: ops$" "leaking param: ops to result err level=0$"
  	enqueue := func(i int) fmt.Stringer { // ERROR "func literal escapes to heap$"
  		return ops(i, j) // ERROR "ops\(i, j\) escapes to heap$"
  	}
  	err = enqueue(4)
  	if err != nil {
  		return err
  	}
  	return // return result of enqueue, a fmt.Stringer
  }
  
  func main() {
  	// 3 identical functions, to get different escape behavior.
  	f := func(i, j int) ent { // ERROR "func literal escapes to heap$"
  		return ent(i + j)
  	}
  	i := foo(f, 3).(ent)
  	fmt.Printf("foo(f,3)=%d\n", int(i)) // ERROR "int\(i\) escapes to heap$" "main ... argument does not escape$"
  }
  

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