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https://github.com/golang/go
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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
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// Copyright 2013 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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// Issue 4909: compiler incorrectly accepts unsafe.Offsetof(t.x)
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// where x is a field of an embedded pointer field.
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package p
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import (
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"unsafe"
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)
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type T struct {
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A int
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*B
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}
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func (t T) Method() {}
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type B struct {
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X, Y int
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}
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var t T
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var p *T
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const N1 = unsafe.Offsetof(t.X) // ERROR "indirection"
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const N2 = unsafe.Offsetof(p.X) // ERROR "indirection"
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const N3 = unsafe.Offsetof(t.B.X) // valid
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const N4 = unsafe.Offsetof(p.B.X) // valid
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const N5 = unsafe.Offsetof(t.Method) // ERROR "method value"
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const N6 = unsafe.Offsetof(p.Method) // ERROR "method value"
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