diff --git a/tests/eval.rkt b/tests/eval.rkt
index 8e9ac3b..c142e70 100644
--- a/tests/eval.rkt
+++ b/tests/eval.rkt
@@ -27,8 +27,17 @@
 (define (exp-final-node e)
   (program-final-node (exp->program e)))
 
+(define rec-program
+  '((define (pair x y f) ((f x) y))
+    (define (fst p) (p K))
+    (define (snd p) (p K1))
+    (define (f x y)
+      (letrec ((a ((pair x) b)) (b ((pair y) a))) (fst (snd (snd (snd a))))))
+    (define (main) ((f 3) 4))))
+
 (check-equal? (exp-final-node (ap-exp 'S 'K 'K 3)) 3)
 (check-equal? (exp-final-node (ap-exp 'K 100 99)) 100)
 (check-equal? (exp-final-node `(let ((x ,(ap-exp 'S 'K 'K 3)) (y 5)) ,(ap-exp 'K 'x 'x))) 3)
 (check-equal? (exp-final-node `(let ((x ,(ap-exp 'S 'K 'K 3)) (y 5)) ,(ap-exp 'K 'y 'x))) 5)
 (check-equal? (exp-final-node `(letrec ((y x) (x ,(ap-exp 'S 'K 'K 3))) ,(ap-exp 'K 'y 'x))) 3)
+(check-equal? (program-final-node rec-program) 4)
diff --git a/typed-parser.rkt b/typed-parser.rkt
index dfc67b3..be60d1f 100644
--- a/typed-parser.rkt
+++ b/typed-parser.rkt
@@ -1,7 +1,25 @@
 #lang typed/racket
 (require "ast.rkt")
+(require racket/cmdline)
 (require/typed "parser.rkt"
   [parse-from-port (-> Input-Port CoreProgram)]
   [parse-from-string (-> String CoreProgram)])
 
+
+
+(module* main #f
+  (: filename Path-String)
+  (define filename
+    (let ([result (command-line
+                   #:program "core-parser"
+                   #:args (filename)
+                   filename)])
+      (if (path-string? result)
+          result
+          (error "Commandline parser returned unexpected results"))))
+
+
+  (pretty-print (parse-from-port
+                 (open-input-file filename))))
+
 (provide parse-from-port parse-from-string)