From b4bb970e1852e9f5340b846379ce4a434a1b9d26 Mon Sep 17 00:00:00 2001
From: Stephen Ma <stephenm@golang.org>
Date: Mon, 13 Jun 2011 22:50:51 +1000
Subject: [PATCH] gc: handle go print() and go println()

Fixes #1952.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4611041
---
 src/cmd/gc/walk.c | 11 ++++++++++-
 test/golden.out   |  3 +++
 test/goprint.go   | 14 ++++++++++++++
 3 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 test/goprint.go

diff --git a/src/cmd/gc/walk.c b/src/cmd/gc/walk.c
index 65a504bff5..4d06179eb8 100644
--- a/src/cmd/gc/walk.c
+++ b/src/cmd/gc/walk.c
@@ -243,7 +243,16 @@ walkstmt(Node **np)
 		break;
 
 	case OPROC:
-		walkexpr(&n->left, &n->ninit);
+		switch(n->left->op) {
+		case OPRINT:
+		case OPRINTN:
+			walkexprlist(n->left->list, &n->ninit);
+			n->left = walkprint(n->left, &n->ninit, 1);
+			break;
+		default:
+			walkexpr(&n->left, &n->ninit);
+			break;
+		}
 		break;
 
 	case ORETURN:
diff --git a/test/golden.out b/test/golden.out
index 4400e41dd1..655ceda565 100644
--- a/test/golden.out
+++ b/test/golden.out
@@ -21,6 +21,9 @@ panic: runtime error: hash of unhashable type []int
 printing: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
 42 true false true +1.500000e+000 world 0x0 [0/0]0x0 0x0 0x0 255
 
+=========== ./goprint.go
+42 true false true +1.500000e+000 world 0x0 [0/0]0x0 0x0 0x0 255
+
 =========== ./helloworld.go
 hello, world
 
diff --git a/test/goprint.go b/test/goprint.go
new file mode 100644
index 0000000000..c0e34c750e
--- /dev/null
+++ b/test/goprint.go
@@ -0,0 +1,14 @@
+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// Copyright 2011 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 "time"
+
+func main() {
+	go println(42, true, false, true, 1.5, "world", (chan int)(nil), []int(nil), (map[string]int)(nil), (func())(nil), byte(255))
+	time.Sleep(1e6)
+}