From 059bbdd34002406d5226fe684b94409a570aa2ee Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Mon, 27 Jul 2009 16:17:09 -0700
Subject: [PATCH] print(1<<x)

R=ken
OCL=32252
CL=32252
---
 src/cmd/gc/const.c       |  2 +-
 src/cmd/gc/walk.c        |  7 ++++---
 test/fixedbugs/bug174.go | 12 ++++++++++++
 3 files changed, 17 insertions(+), 4 deletions(-)
 create mode 100644 test/fixedbugs/bug174.go

diff --git a/src/cmd/gc/const.c b/src/cmd/gc/const.c
index cc58a2c1709..73a23bf83a6 100644
--- a/src/cmd/gc/const.c
+++ b/src/cmd/gc/const.c
@@ -94,7 +94,7 @@ convlit1(Node **np, Type *t, int explicit)
 		break;
 	case OLSH:
 	case ORSH:
-		convlit(&n->left, t);
+		convlit1(&n->left, t, explicit);
 		n->type = n->left->type;
 		return;
 	}
diff --git a/src/cmd/gc/walk.c b/src/cmd/gc/walk.c
index 31db1e7b4c2..2402ef3b629 100644
--- a/src/cmd/gc/walk.c
+++ b/src/cmd/gc/walk.c
@@ -858,7 +858,8 @@ reswitch:
 		defaultlit(&n->right, types[TUINT]);
 		if(n->left->type == T || n->right->type == T)
 			goto ret;
-		if(issigned[n->right->type->etype] || !isint[n->right->type->etype])
+		et = n->right->type->etype;
+		if(issigned[et] || !isint[et])
 			goto badt;
 		// check of n->left->type happens in second switch.
 		break;
@@ -2500,14 +2501,14 @@ prcompat(NodeList *all, int fmt, int dopanic)
 			switch(n->val.ctype) {
 			case CTINT:
 				defaultlit(&n, types[TINT64]);
-				l->n = n;
 				break;
 			case CTFLT:
 				defaultlit(&n, types[TFLOAT64]);
-				l->n = n;
 				break;
 			}
 		}
+		defaultlit(&n, nil);
+		l->n = n;
 		if(n->type == T)
 			continue;
 
diff --git a/test/fixedbugs/bug174.go b/test/fixedbugs/bug174.go
new file mode 100644
index 00000000000..7ff86551326
--- /dev/null
+++ b/test/fixedbugs/bug174.go
@@ -0,0 +1,12 @@
+// $G $D/$F.go || echo BUG: bug174
+
+// 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 main() {
+	var x uint;
+	println(1<<x);
+}