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cmd/compile: improve error message if init is directly invoked
Fixes #8481. Inform the user that init functions cannot be directly invoked in user code, as mandated by the spec at: http://golang.org/ref/spec#Program_initialization_and_execution. Change-Id: Ib12c0c08718ffd48b76b6f9b13c76bb6612d2e7b Reviewed-on: https://go-review.googlesource.com/34790 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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@ -3648,11 +3648,19 @@ func typecheckdef(n *Node) *Node {
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lineno = n.Pos
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}
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// Note: adderrorname looks for this string and
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// adds context about the outer expression
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yyerror("undefined: %v", n.Sym)
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switch n.Sym.Name {
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case "init":
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// As per the spec at:
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// https://golang.org/ref/spec#Program_initialization_and_execution
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// init cannot be referred to in usercode.
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// See https://golang.org/issues/8481.
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yyerror("cannot refer to init functions")
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default:
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// Note: adderrorname looks for this string and
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// adds context about the outer expression
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yyerror("undefined: %v", n.Sym)
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}
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}
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return n
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}
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14
test/fixedbugs/issue8481.go
Normal file
14
test/fixedbugs/issue8481.go
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@ -0,0 +1,14 @@
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// errorcheck
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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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package main
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func init() {
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}
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func main() {
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init() // ERROR "cannot refer to init functions"
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}
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@ -15,7 +15,7 @@ func init() {
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}
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func main() {
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init() // ERROR "undefined.*init"
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init() // ERROR "cannot refer to init functions"
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runtime.init() // ERROR "unexported.*runtime\.init"
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var _ = init // ERROR "undefined.*init"
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var _ = init // ERROR "cannot refer to init functions"
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}
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