[MERGE #3111 @suwc] Issue3076: Assertion Failure in Parsing

Merge pull request #3111 from suwc:build/suwc/Issue3076

Assertion is triggered in parse.cpp on this->m_deferringAST
when CreateCallNode() is called in ParseImportCall().
Fix by adding check for buildAST.

Author: Suwei Chen

lib/Parser/Parse.cpp

@@ -2449,7 +2449,7 @@ template<bool buildAST> ParseNodePtr Parser::ParseImportCall()
     }
 
     m_pscan->Scan();
-    return CreateCallNode(knopCall, CreateNodeWithScanner<knopImport>(), specifier);
+    return buildAST ? CreateCallNode(knopCall, CreateNodeWithScanner<knopImport>(), specifier) : nullptr;
 }
 
 template<bool buildAST>

test/es6/bug_issue_3076.js

@@ -0,0 +1,10 @@
+//-------------------------------------------------------------------------------------------------------
+// Copyright (C) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
+//-------------------------------------------------------------------------------------------------------
+
+function test() {
+    import('passmodule.js');
+}
+
+test();

test/es6/rlexe.xml

@@ -1419,6 +1419,13 @@
     <tags>BugFix</tags>
   </default>
 </test>
+<test>
+  <default>
+    <files>bug_issue_3076.js</files>
+    <compile-flags>-force:deferparse</compile-flags>
+    <tags>BugFix</tags>
+  </default>
+</test>
 <test>
   <default>
     <files>typedarray_bugs.js</files>