impc:ir:genericfunc-stringify-generic-arg-strings   scheme

(define impc:ir:genericfunc-stringify-generic-arg-strings
  (lambda (args)
    (string-join (map (lambda (a)
                        (if (null? a)
                            "_"
                            (let ((r (impc:ir:pptype a)))
                              (if (null? r)
                                  "_"
                                  r))))
                      args) ",")))