cmd/gc: fix inlining of unnamed structs with embedded fields.

Update #5910.

R=golang-dev, daniel.morsing, rsc
CC=golang-dev
https://golang.org/cl/11373044

src/cmd/gc/go.y

@@ -1541,8 +1541,8 @@ structdcl:
 
 		Node *n;
 		l = $1;
-		if(l != nil && l->next == nil && l->n == nil) {
-			// ? symbol, during import
+		if(l == nil) {
+			// ? symbol, during import (list1(N) == nil)
 			n = $2;
 			if(n->op == OIND)
 				n = n->left;

src/cmd/gc/y.tab.h

@@ -1,24 +1,21 @@
-/* A Bison parser, made by GNU Bison 2.3.  */
+/* A Bison parser, made by GNU Bison 2.5.  */
 
-/* Skeleton interface for Bison's Yacc-like parsers in C
-
-   Copyright (C) 1984, 1989, 1990, 2000, 2001, 2002, 2003, 2004, 2005, 2006
-   Free Software Foundation, Inc.
-
-   This program is free software; you can redistribute it and/or modify
+/* Bison interface for Yacc-like parsers in C
+   
+      Copyright (C) 1984, 1989-1990, 2000-2011 Free Software Foundation, Inc.
+   
+   This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
-
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+   
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
-
+   
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* As a special exception, you may create a larger work that contains
    part or all of the Bison parser skeleton and distribute that work
@@ -29,10 +26,11 @@
    special exception, which will cause the skeleton and the resulting
    Bison output files to be licensed under the GNU General Public
    License without this special exception.
-
+   
    This special exception was added by the Free Software Foundation in
    version 2.2 of Bison.  */
 
+
 /* Tokens.  */
 #ifndef YYTOKENTYPE
 # define YYTOKENTYPE
@@ -146,22 +144,28 @@
 
 #if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
 typedef union YYSTYPE
-#line 30 "go.y"
 {
+
+/* Line 2068 of yacc.c  */
+#line 30 "go.y"
+
 	Node*		node;
 	NodeList*		list;
 	Type*		type;
 	Sym*		sym;
 	struct	Val	val;
 	int		i;
-}
-/* Line 1529 of yacc.c.  */
-#line 160 "y.tab.h"
-	YYSTYPE;
+
+
+
+/* Line 2068 of yacc.c  */
+#line 163 "y.tab.h"
+} YYSTYPE;
+# define YYSTYPE_IS_TRIVIAL 1
 # define yystype YYSTYPE /* obsolescent; will be withdrawn */
 # define YYSTYPE_IS_DECLARED 1
-# define YYSTYPE_IS_TRIVIAL 1
 #endif
 
 extern YYSTYPE yylval;
 
+

test/fixedbugs/issue5910.dir/a.go

@@ -0,0 +1,17 @@
+package a
+
+type Package struct {
+	name string
+}
+
+type Future struct {
+	result chan struct {
+		*Package
+	}
+}
+
+func (t *Future) Result() *Package {
+	result := <-t.result
+	t.result <- result
+	return result.Package
+}

test/fixedbugs/issue5910.dir/main.go

@@ -0,0 +1,8 @@
+package main
+
+import "a"
+
+func main() {
+	f := new(a.Future)
+	f.Result()
+}

test/fixedbugs/issue5910.go

@@ -0,0 +1,10 @@
+// compiledir
+
+// 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 5910: parsing of unnamed struct types
+// in inlined bodies was broken.
+
+package ignored