From a587d9a73faf5f4237e6675bb4a53d49c229fced Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Mon, 27 Jul 2009 16:59:10 -0700
Subject: [PATCH] multiple return in := bug

R=ken
OCL=32253
CL=32253
---
 src/cmd/gc/subr.c        |  9 +++++++++
 src/cmd/gc/walk.c        |  4 ++++
 test/fixedbugs/bug175.go | 14 ++++++++++++++
 test/golden.out          |  6 ++++++
 4 files changed, 33 insertions(+)
 create mode 100644 test/fixedbugs/bug175.go

diff --git a/src/cmd/gc/subr.c b/src/cmd/gc/subr.c
index fbfded77cf..14a5fa7b5c 100644
--- a/src/cmd/gc/subr.c
+++ b/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);
diff --git a/src/cmd/gc/walk.c b/src/cmd/gc/walk.c
index 2402ef3b62..31b52434a3 100644
--- a/src/cmd/gc/walk.c
+++ b/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;
diff --git a/test/fixedbugs/bug175.go b/test/fixedbugs/bug175.go
new file mode 100644
index 0000000000..a8f6e3ca40
--- /dev/null
+++ b/test/fixedbugs/bug175.go
@@ -0,0 +1,14 @@
+// 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"
+}
+
diff --git a/test/golden.out b/test/golden.out
index 5c50da5a75..605a9b31ac 100644
--- a/test/golden.out
+++ b/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)