fix: location for expressionstatement

Author: alexander-akait

src/parser/variable.js

@@ -237,6 +237,11 @@ module.exports = {
     }
     return result;
   },
+
+  read_encaps_var: function() {
+
+  },
+
   /**
    * https://github.com/php/php-src/blob/493524454d66adde84e00d249d607ecd540de99f/Zend/zend_language_parser.y#L1231
    */