From f617b08def3f665eef48b9b72382047e80cc08a4 Mon Sep 17 00:00:00 2001
From: otya128 <otya128@users.noreply.github.com>
Date: Fri, 23 Dec 2016 17:18:43 +0900
Subject: [PATCH] Fix USE/EXEC error check

---
 SMILEBASIC/parser.d | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/SMILEBASIC/parser.d b/SMILEBASIC/parser.d
index 4f09c76..14a6bf5 100644
--- a/SMILEBASIC/parser.d
+++ b/SMILEBASIC/parser.d
@@ -1111,6 +1111,11 @@ class Parser
                 {
                     lex.popFront();
                     auto expr = expression();
+                    if (!expr)
+                    {
+                        syntaxError();
+                        return null;
+                    }
                     return new Use(expr, lex.location);
                 }
                 break;
@@ -1118,6 +1123,11 @@ class Parser
                 {
                     lex.popFront();
                     auto expr = expression();
+                    if (!expr)
+                    {
+                        syntaxError();
+                        return null;
+                    }
                     return new Exec(expr, lex.location);
                 }
                 break;