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cmd/compile: make case insensitive suggestions aware of package

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Ensure that compiler error suggestions after case insensitive
field lookups don't mistakenly reported unexported fields if
those fields aren't in the local package being processed.

Fixes #25727

Change-Id: Icae84388c2a82c8cb539f3d43ad348f50a644caa
Reviewed-on: https://go-review.googlesource.com/117755
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Emmanuel T Odeke 2018-06-10 17:17:49 -07:00 committed by Robert Griesemer
parent b8dc931326
commit 7bc99ffa05
2 changed files with 32 additions and 2 deletions
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13
src/cmd/compile/internal/gc/typecheck.go
View file

@ -919,7 +919,7 @@ func typecheck1(n *Node, top int) *Node {
yyerror("%v undefined (cannot refer to unexported field or method %v)", n, n.Sym)
default:
if mt := lookdot(n, t, 2); mt != nil { // Case-insensitive lookup.
if mt := lookdot(n, t, 2); mt != nil && visible(mt.Sym) { // Case-insensitive lookup.
yyerror("%v undefined (type %v has no field or method %v, but does have %v)", n, n.Left.Type, n.Sym, mt.Sym)
} else {
yyerror("%v undefined (type %v has no field or method %v)", n, n.Left.Type, n.Sym)
@ -3132,7 +3132,11 @@ func typecheckcomplit(n *Node) *Node {
f := lookdot1(nil, l.Sym, t, t.Fields(), 0)
if f == nil {
if ci := lookdot1(nil, l.Sym, t, t.Fields(), 2); ci != nil { // Case-insensitive lookup.
yyerror("unknown field '%v' in struct literal of type %v (but does have %v)", l.Sym, t, ci.Sym)
if visible(ci.Sym) {
yyerror("unknown field '%v' in struct literal of type %v (but does have %v)", l.Sym, t, ci.Sym)
} else {
yyerror("unknown field '%v' in struct literal of type %v", l.Sym, t)
}
continue
}
p, _ := dotpath(l.Sym, t, nil, true)
@ -3179,6 +3183,11 @@ func typecheckcomplit(n *Node) *Node {
return n
}
// visible reports whether sym is exported or locally defined.
func visible(sym *types.Sym) bool {
return sym != nil && (types.IsExported(sym.Name) || sym.Pkg == localpkg)
}
// lvalue etc
func islvalue(n *Node) bool {
switch n.Op {

21
test/fixedbugs/issue25727.go Normal file
View file

@ -0,0 +1,21 @@
// errorcheck
// Copyright 2018 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.
package main
import "net/http"
var s = http.Server{}
var _ = s.doneChan // ERROR "s.doneChan undefined .cannot refer to unexported field or method doneChan.$"
var _ = s.DoneChan // ERROR "s.DoneChan undefined .type http.Server has no field or method DoneChan.$"
var _ = http.Server{tlsConfig: nil} // ERROR "unknown field 'tlsConfig' in struct literal.+ .but does have TLSConfig.$"
var _ = http.Server{DoneChan: nil} // ERROR "unknown field 'DoneChan' in struct literal of type http.Server$"
type foo struct {
bar int
}
var _ = &foo{bAr: 10} // ERROR "unknown field 'bAr' in struct literal.+ .but does have bar.$"