From b5e04cb070b597ac848ed5222bf814db8a506726 Mon Sep 17 00:00:00 2001
From: AnotherTest <ali.mpfard@gmail.com>
Date: Tue, 7 Jul 2020 17:16:01 +0430
Subject: [PATCH] Shell: Skip creating a Join node when nothing was parsed

This fixes a crash when Shell tries to highlight `|`.
---
 Shell/Parser.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Shell/Parser.cpp b/Shell/Parser.cpp
index 70357de1323..d7e038261a4 100644
--- a/Shell/Parser.cpp
+++ b/Shell/Parser.cpp
@@ -123,7 +123,10 @@ RefPtr<AST::Node> Parser::parse()
         // Parsing stopped midway, this is a syntax error.
         auto error_start = push_start();
         m_offset = m_input.length();
-        return create<AST::Join>(move(toplevel), create<AST::SyntaxError>("Unexpected tokens past the end"));
+        auto syntax_error_node = create<AST::SyntaxError>("Unexpected tokens past the end");
+        if (toplevel)
+            return create<AST::Join>(move(toplevel), move(syntax_error_node));
+        return syntax_error_node;
     }
 
     return toplevel;