code: function isInFunctionalCall(lex) {
              // in a call, or inside array or object brackets that are inside a function.
              return (lex && (lex.info === "call" ||
                  (lex.info === undefined && (lex.type === "]" || lex.type === "}") &&
                      lex.prev.info === "call")));
          }
docs: Test is a lexical state is in a function call.
  
  @param {Object} lex - lexical state.
  @return {Object | boolean}