multiple return in := bug

R=ken
OCL=32253
CL=32253

src/cmd/gc/subr.c

@@ -1112,6 +1112,15 @@ Tpretty(Fmt *fp, Type *t)
 		return fmtprint(fp, " }");
 
 	case TSTRUCT:
+		if(t->funarg) {
+			fmtprint(fp, "(");
+			for(t1=t->type; t1!=T; t1=t1->down) {
+				fmtprint(fp, "%T", t1);
+				if(t1->down)
+					fmtprint(fp, ", ");
+			}
+			return fmtprint(fp, ")");
+		}
 		fmtprint(fp, "struct {");
 		for(t1=t->type; t1!=T; t1=t1->down) {
 			fmtprint(fp, " %T", t1);

src/cmd/gc/walk.c

@@ -3673,6 +3673,10 @@ old2new(Node *n, Type *t, NodeList **init)
 		yyerror("left side of := must be a name");
 		return n;
 	}
+	if(t != T && t->funarg) {
+		yyerror("use of multi func value as single value in :=");
+		return n;
+	}
 	l = newname(n->sym);
 	dodclvar(l, t, init);
 	return l;

test/fixedbugs/bug175.go

+// errchk $G $D/$F.go
+
+// 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.
+
+package main
+
+func f() (int, bool) { return 0, true }
+
+func main() {
+	x, y := f(), 2;	// ERROR "multi"
+}
+

test/golden.out

@@ -235,3 +235,9 @@ fixedbugs/bug131.go:7: illegal types for operand: AS
 fixedbugs/bug133.dir/bug2.go:11: undefined: bug0.T field i
 fixedbugs/bug133.dir/bug2.go:11: illegal types for operand: RETURN
 	int
+
+=========== fixedbugs/bug175.go
+fixedbugs/bug175.go:8: use of multi func value as single value in :=
+fixedbugs/bug175.go:8: undefined: x
+fixedbugs/bug175.go:8: illegal types for operand: AS
+	(int, bool)