instanceof throws typeerror if right side isn't a function
instanceof throws typeerror if right side isn't a function

brownplt/LambdaS5,lijunsong/LambdaS5,lijunsong/LambdaS5,logchi/LambdaS5,logchi/LambdaS5,logchi/LambdaS5,brownplt/LambdaS5,brownplt/LambdaS5,lijunsong/LambdaS5