6g bug fixes:

* bug211
 * embedded interfaces with lowercase methods
 * var _ = f() at top level

R=ken
OCL=35898
CL=35898

src/cmd/gc/dcl.c

@@ -762,15 +762,20 @@ ok:
 Type**
 stotype(NodeList *l, int et, Type **t)
 {
-	Type *f, *t1, **t0;
+	Type *f, *t1, *t2, **t0;
 	Strlit *note;
 	int lno;
 	NodeList *init;
 	Node *n;
+	char *what;
 
 	t0 = t;
 	init = nil;
 	lno = lineno;
+	what = "field";
+	if(et == TINTER)
+		what = "method";
+
 	for(; l; l=l->next) {
 		n = l->n;
 		lineno = n->lineno;
@@ -827,14 +832,17 @@ stotype(NodeList *l, int et, Type **t)
 				continue;
 			}
 			for(t1=n->type->type; t1!=T; t1=t1->down) {
-				// TODO(rsc): Is this really an error?
-				if(strcmp(t1->sym->package, package) != 0)
-					yyerror("embedded interface contains unexported method %S", t1->sym);
 				f = typ(TFIELD);
 				f->type = t1->type;
 				f->width = BADWIDTH;
 				f->nname = newname(t1->sym);
 				f->sym = t1->sym;
+				for(t2=*t0; t2!=T; t2=t2->down) {
+					if(t2->sym == f->sym) {
+						yyerror("duplicate method %s", t2->sym->name);
+						break;
+					}
+				}
 				*t = f;
 				t = &f->down;
 			}
@@ -855,7 +863,7 @@ stotype(NodeList *l, int et, Type **t)
 			if(f->sym && !isblank(f->nname)) {
 				for(t1=*t0; t1!=T; t1=t1->down) {
 					if(t1->sym == f->sym) {
-						yyerror("duplicate field %s", t1->sym->name);
+						yyerror("duplicate %s %s", what, t1->sym->name);
 						break;
 					}
 				}

src/cmd/gc/sinit.c

@@ -27,6 +27,8 @@ init1(Node *n, NodeList **out)
 	case PFUNC:
 		break;
 	default:
+		if(isblank(n))
+			*out = list(*out, n->defn);
 		return;
 	}
 

test/blank.go

@@ -52,7 +52,11 @@ func i() int {
 	return 23;
 }
 
+var _ = i();
+
 func main() {
+	if call != "i" {panic("init did not run")}
+	call = "";
 	_, _ = f();
 	a, _ := f();
 	if a != 1 {panic(a)}

test/golden.out

@@ -157,6 +157,3 @@ BUG: errchk: bugs/bug193.go:14: missing expected error: 'shift'
 too many calls: 5
 panic PC=xxx
 BUG: bug196
-
-=========== bugs/bug211.go
-BUG: errchk: command succeeded unexpectedly

test/interface/embed.go

@@ -34,7 +34,7 @@ var pi = &i
 
 var ok = true
 
-func check(v int64, s string) {
+func check(s string, v int64) {
 	if v != Value {
 		println(s, v);
 		ok = false;
@@ -42,38 +42,38 @@ func check(v int64, s string) {
 }
 
 func main() {
-	check(t.M(), "t.M");
+	check("t.M()", t.M());
-	check(pt.M(), "pt.M");
+	check("pt.M()", pt.M());
-	check(ti.M(), "ti.M");
+	check("ti.M()", ti.M());
-	check(pti.M(), "pti.M");
+	check("pti.M()", pti.M());
-	check(s.M(), "s.M");
+	check("s.M()", s.M());
-	check(ps.M(), "ps.M");
+	check("ps.M()", ps.M());
-	check(sp.M(), "sp.M");
+	check("sp.M()", sp.M());
-	check(psp.M(), "psp.M");
+	check("psp.M()", psp.M());
 
 	i = t;
-	check(i.M(), "i.M - i = t");
+	check("i = t; i.M()", i.M());
-	check(pi.M(), "pi.M - i = t");
+	check("i = t; pi.M()", pi.M());
 
 	i = pt;
-	check(i.M(), "i.M - i = pt");
+	check("i = pt; i.M()", i.M());
-	check(pi.M(), "pi.M - i = pt");
+	check("i = pt; pi.M()", pi.M());
 
 	i = s;
-	check(i.M(), "i.M - i = s");
+	check("i = s; i.M()", i.M());
-	check(pi.M(), "pi.M - i = s");
+	check("i = s; pi.M()", pi.M());
 
 	i = ps;
-	check(i.M(), "i.M - i = ps");
+	check("i = ps; i.M()", i.M());
-	check(pi.M(), "pi.M - i = ps");
+	check("i = ps; pi.M()", pi.M());
 
 	i = sp;
-	check(i.M(), "i.M - i = sp");
+	check("i = sp; i.M()", i.M());
-	check(pi.M(), "pi.M - i = sp");
+	check("i = sp; pi.M()", pi.M());
 
 	i = psp;
-	check(i.M(), "i.M - i = psp");
+	check("i = psp; i.M()", i.M());
-	check(pi.M(), "pi.M - i = psp");
+	check("i = psp; pi.M()", pi.M());
 
 	if !ok {
 		println("BUG: interface10");

test/interface/embed1.go

@@ -0,0 +1,45 @@
+// $G $D/embed0.go && $G $D/$F.go && $L embed0.$A $F.$A && ./$A.out
+
+// Copyright 2009 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.
+
+// Check that embedded interface types can have local methods.
+
+package main
+
+import "./embed0"
+
+type T int
+func (t T) m() {}
+
+type I interface { m() }
+type J interface { I; }
+
+type PI interface { p.I; }
+type PJ interface { p.J; }
+
+func main() {
+	var i I;
+	var j J;
+	var t T;
+	i = t;
+	j = t;
+	_ = i;
+	_ = j;
+	i = j;
+	_ = i;
+	j = i;
+	_ = j;
+	var pi PI;
+	var pj PJ;
+	var pt p.T;
+	pi = pt;
+	pj = pt;
+	_ = pi;
+	_ = pj;
+	pi = pj;
+	_ = pi;
+	pj = pi;
+	_ = pj;
+}