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https://github.com/golang/go
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48 lines
1.4 KiB
Go
48 lines
1.4 KiB
Go
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// errorcheck -0 -N -m -l
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// The escape analyzer needs to run till its root set settles
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// (this is not that often, it turns out).
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// This test is likely to become stale because the leak depends
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// on a spurious-escape bug -- return an interface as a named
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// output parameter appears to cause the called closure to escape,
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// where returning it as a regular type does not.
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package main
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import (
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"fmt"
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)
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type closure func(i, j int) ent
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type ent int
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func (e ent) String() string {
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return fmt.Sprintf("%d", int(e)) // ERROR "ent.String ... argument does not escape$" "int\(e\) escapes to heap$"
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}
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//go:noinline
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func foo(ops closure, j int) (err fmt.Stringer) { // ERROR "leaking param: ops$" "leaking param: ops to result err level=0$"
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enqueue := func(i int) fmt.Stringer { // ERROR "func literal escapes to heap$"
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return ops(i, j) // ERROR "ops\(i, j\) escapes to heap$"
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}
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err = enqueue(4)
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if err != nil {
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return err
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}
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return // return result of enqueue, a fmt.Stringer
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}
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func main() {
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// 3 identical functions, to get different escape behavior.
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f := func(i, j int) ent { // ERROR "func literal escapes to heap$"
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return ent(i + j)
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}
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i := foo(f, 3).(ent)
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fmt.Printf("foo(f,3)=%d\n", int(i)) // ERROR "int\(i\) escapes to heap$" "main ... argument does not escape$"
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}
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