===
Discard
===
let result = input
	| discard "%.c"
	| assert-eq ["b.cpp"]
---

(source_file
  (let
    (identifier)
    (exp
      (pipe
        (exp
          (identifier))
        (op
          (discard
            (exp
              (pipe
                (exp
                  (string))
                (op
                  (assertEq
                    (exp
                      (list
                        (exp
                          (string))))))))))))))
