Handle array variable declaration

source/lexer.ll

@@ -61,6 +61,12 @@ const                   {
 var                     {
                             return yy::parser::make_VAR(this->location);
                         }
+array                   {
+                            return yy::parser::make_ARRAY(this->location);
+                        }
+of                      {
+                            return yy::parser::make_OF(this->location);
+                        }
 true                    {
                             return yy::parser::make_BOOLEAN(true, this->location);
                         }