mirror of
https://github.com/golang/go
synced 2024-11-05 18:46:11 -07:00
2d3216f4a8
The offset of an embedded field s.X must be relative to s and not to the implicit s.Field of which X is a direct field. Moreover, no indirections may happen on the path. Fixes #4909. R=nigeltao, ality, daniel.morsing, iant, gri, r CC=golang-dev https://golang.org/cl/8287043
36 lines
762 B
Go
36 lines
762 B
Go
// errorcheck
|
|
|
|
// Copyright 2013 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.
|
|
|
|
// Issue 4909: compiler incorrectly accepts unsafe.Offsetof(t.x)
|
|
// where x is a field of an embedded pointer field.
|
|
|
|
package p
|
|
|
|
import (
|
|
"unsafe"
|
|
)
|
|
|
|
type T struct {
|
|
A int
|
|
*B
|
|
}
|
|
|
|
func (t T) Method() {}
|
|
|
|
type B struct {
|
|
X, Y int
|
|
}
|
|
|
|
var t T
|
|
var p *T
|
|
|
|
const N1 = unsafe.Offsetof(t.X) // ERROR "indirection"
|
|
const N2 = unsafe.Offsetof(p.X) // ERROR "indirection"
|
|
const N3 = unsafe.Offsetof(t.B.X) // valid
|
|
const N4 = unsafe.Offsetof(p.B.X) // valid
|
|
const N5 = unsafe.Offsetof(t.Method) // ERROR "method value"
|
|
const N6 = unsafe.Offsetof(p.Method) // ERROR "method value"
|