Index: src/Parser/parser.yy
===================================================================
--- src/Parser/parser.yy	(revision 5b544a6a33b882680dc245c678d32ddb6742f4a2)
+++ src/Parser/parser.yy	(revision dfda49f434322aee3e05dbbb9524cdf901d195c7)
@@ -10,6 +10,6 @@
 // Created On       : Sat Sep  1 20:22:55 2001
 // Last Modified By : Peter A. Buhr
-// Last Modified On : Wed Feb 26 14:27:39 2020
-// Update Count     : 4472
+// Last Modified On : Fri Mar  6 17:26:45 2020
+// Update Count     : 4474
 //
 
@@ -919,5 +919,11 @@
 	conditional_expression
 	| unary_expression assignment_operator assignment_expression
-		{ $$ = new ExpressionNode( build_binary_val( $2, $1, $3 ) ); }
+		{
+			if ( $2 == OperKinds::AtAssn ) {
+				SemanticError( yylloc, "C @= assignment is currently unimplemented." ); $$ = nullptr;
+			} else {
+				$$ = new ExpressionNode( build_binary_val( $2, $1, $3 ) );
+			} // if
+		}
 	| unary_expression '=' '{' initializer_list_opt comma_opt '}'
 		{ SemanticError( yylloc, "Initializer assignment is currently unimplemented." ); $$ = nullptr; }