diff --git a/src/examples/forbble.pbl b/src/examples/forbble.pbl
index 5e63a85..01984c8 100644
--- a/src/examples/forbble.pbl
+++ b/src/examples/forbble.pbl
@@ -28,7 +28,9 @@
 (def twop (fn (op)
   "Apply the given operation to the top two stack elements" (
   (if (< (len stack) 2) (prnl "stack too small!") (
-    (def val (op (pop) (pop)))
+    (def left (pop))
+    (def right (pop))
+    (def val (op right left))
     (stkadd val)
   ))
 )))
@@ -146,18 +148,66 @@
 
 (for-each feval (
   ": fib swap over + $"
+
+  ; Peek at the top of the stack
   ": peek dup . $"
+
+  ; Basic imperial distances (with inches as the base unit)
+  ": ft 12 * $"
+  ": yd 3 ft * $"
+  ": yds 3 ft * $"
+  ": in $"
+  ": >ft 1 ft / $"
+  ": >yds 1 yd / $"
+
+  ; Convert between Farenheit and Celcius
+  ": f>c 32 - 5 * 9 / $"
+  ": c>f 9 * 5 / 32 + $"
 ))
 
+(def plf-assert (fn (test expected) (
+  (set stack ())
+  (prn "Test '" test "'")
+  (feval test)
+  (def actual (at 0 stack))
+  (if (= actual expected)
+    (prnl " passed!")
+    (prnl (cat " failed! Expected '" expected "' but received '" actual "'")))
+)))
+
+(def plf-tests (fn () (
+  (plf-assert "100 c>f" 212)
+  (plf-assert "10 yds >ft" 30)
+  (plf-assert "1 1 fib fib fib fib fib fib fib" 34)
+
+  (set stack ())
+)))
+
 (def esc (ch 27))
 (def reset (cat esc "[0m"))
 (def fprompt (cat esc "[33;1mplf:> " reset))
+(plf-tests)
 
-; Override the normal REPL prompt
-; Also nice because it doesn't force into the REPL when just loading this file
-(set prompt fprompt)
-(set preprocess (fn (text) (
-  (feval text)
-  (prn nl)
-  "" ; Have the underlying REPL do nothing
+(def original-prompt prompt)
+(def original-preprocess preprocess)
+
+(def restore-repl (fn () (
+  (set prompt original-prompt)
+  (set preprocess original-preprocess)
 )))
+
+(def plf-repl (fn () (
+  ; Override the normal REPL prompt
+  (set prompt fprompt)
+  (set preprocess (fn (text) (
+    (if (= "qqq" text) ((restore-repl) "") (
+      (feval text)
+      (prn nl)
+      "" ; Have the underlying REPL do nothing
+    ))
+  )))
+)))
+
+(plf-repl)
+
+"forbble loaded"
diff --git a/src/examples/forbble_old.pbl b/src/examples/forbble_old.pbl
deleted file mode 100755
index 0a0334e..0000000
--- a/src/examples/forbble_old.pbl
+++ /dev/null
@@ -1,171 +0,0 @@
-#!/usr/bin/pl
-
-; Initialize an empty stack
-(def stack ())
-
-; Add the given num to the stack
-(def stkadd (fn (a)
-  (def stack (pre stack a))))
-
-; Silently remove the top of the stack
-(def _pop (fn (_)
-  (def stack (rest stack))))
-
-; Remove and return the stack top
-(def bop (fn (_) (
-  (def _a (at 0 stack))
-  (_pop 0)
-  _a
-  )))
-
-; Loud, checked version of _pop
-(def pop (fn (_)
-  (if (> (len stack 0) 0) (
-    (prn (at 0 stack))
-      (_pop 0))
-    (prnl "pop: STACK EMPTY")
-  )))
-
-; Takes a two-parameter operation and
-; applies it to the top two stack elements
-(def twop (fn (_op) (
-  (if (> (len stack) 1) (
-    (def (_b _a) ((bop 0) (bop 0)))
-      (stkadd (_op _a _b)))
-    (prnl "twop: STACK TOO SMALL")
-  ))))
-
-; Define important symbols/functions
-; An annoying hack for right now
-(def . ".")
-(def : ":")
-(def ^ "^")
-(def $ "$")
-(def swap "swap")
-(def dup "dup")
-(def rot "rot")
-(def over "over")
-
-; Duplicate the top element of the stack
-(def _dup (fn (_) (
-  (def _top (at 0 stack))
-  (if (iserr _top) (prnl "dup: STACK EMPTY")
-    (stkadd _top))
-)))
-
-; Swap the top two elements of the stack, if possible
-(def _swap (fn (_) (
-  (if (> (len stack) 1) (
-    (def (_b _a) ((bop 0) (bop 0)))
-      (stkadd _b)
-      (stkadd _a))
-    (prnl "swap: STACK TOO SMALL")
-  ))))
-
-; Rotate the third element to be above the first and second elements
-(def _rot (fn (_) (
-  (if (> (len stack) 2) (
-    (def (_c _b _a) ((bop 0) (bop 0) (bop 0)))
-      (stkadd _b)
-      (stkadd _c)
-      (stkadd _a))
-    (prnl "rot: STACK TOO SMALL")
-  ))))
-
-; Rotate the third element to be above the first and second elements
-(def _over (fn (_) (
-  (if (> (len stack) 1) (
-    (def _a (at 1 stack))
-      (stkadd _a))
-    (prnl "over: STACK TOO SMALL")
-  ))))
-
-; Defines a given symbol using a given list of Forth inputs
-(def compile (fn (func sym) (
-  ; Get next symbol
-  (def _x (at 0 func))
-  (if (iserr _x) _x
-  (if (= _x "$") (rest func)
-    (at 1 (
-      (defe sym (ap (eval sym) _x))
-      (compile (rest func) sym)))
-  )))))
-
-; Evaluate a list of Forth inputs
-(def feval (fn (list) (
-  (if (> (len list) 0) (
-    (def _x (at 0 list))
-    (if (isnum _x) (stkadd _x) ; Push to the stack if it's a number
-    (if (= "." _x) (pop 0) ; Pop if it's a dot
-    (if (= + _x) (twop +) ; Try basic arithmetic
-    (if (= - _x) (twop -)
-    (if (= * _x) (twop *)
-    (if (= / _x) (twop /)
-    (if (= "swap" _x) (_swap 0)
-    (if (= "dup" _x) (_dup 0)
-    (if (= "rot" _x) (_rot 0)
-    (if (= "over" _x) (_over 0)
-    (if (= "^" _x) (pch (bop 0))
-    (if (= ":" _x) ( ; Compile a phrase into the next symbol
-      (def var (at 1 list))     ; Collect the symbol to define, as a string
-        (defe var (+ "_" var))  ; Add an underscore for the internal storage
-        (defe (+ "_" var) ())   ; Define _func internally as an empty list
-        (def list (compile      ; Overwrite list with output of (compile)
-          (rest (rest list))    ; Current list, not including ':' or the symbol
-          (+ "_" var))))        ; The internal variable name
-    ( ; If none of the above hit, try to interpret as a compiled symbol
-      (if (iserr _x) (prnl _x) (
-        (def _e (eval _x))
-        (if (iserr (len _e)) () (feval _e))
-      ))
-    )
-    ))))))))))))
-    ; A switch/case operator might be good, to avoid huge closing-paren chains
-
-    ; If any list is left, recurse into it
-    (if (> (len list) 0) (feval (rest list)) ())
-
-  ) () ; Meow!
-  ))))
-
-; A simple test of the built-in arithmetic
-(def test (fn (_) (
-  (prnl "Should match:")
-  (prnl "18 33 4 -4")
-  (feval ( 6 3 * . 32 ^ 100 3 / . 32 ^ 2 2 + . 32 ^ 5 9 - . ))
-  (pch 10)
-  (pch 10)
-  )))
-
-;; Example Compilations
-; Basic imperial distances
-(feval (: "ft" 12 * $))
-(feval (: "yd" ft 3 * $))
-(feval (: "yds" yd $))
-(feval (: "in" $))
-(feval (: ">ft" 1 ft / $))
-(feval (: ">yds" 1 yd / $))
-
-; Convert between Farenheit and Celcius
-(feval (: "f>c" 32 - 5 * 9 /$))
-(feval (: "c>f" 9 * 5 / 32 + $))
-
-; Math
-(feval (: "sq" dup * $))
-; Gets next Fibonacci number from two on stack
-(feval (: "_f" swap over + $))
-(feval (: "fib" _f dup . $))
-
-;; A simple REPL. Exits on 'q'
-;(def repl (fn (_) (
-;  (prn "forbble::> ")
-;  (def _inp (inp 0 0))
-;  (if (= "q" _inp) () (
-;    (def _str (+ "(feval (" _inp "))" ))
-;    (eval _str)
-;    (pch 10)
-;    (repl 0)
-;  )))))
-;
-;; Run the REPL
-;(repl 0)
diff --git a/src/main.c b/src/main.c
index 97dad85..1254f88 100644
--- a/src/main.c
+++ b/src/main.c
@@ -91,11 +91,11 @@ void repl(struct Environment* env)
     read_history(settings.historyFile);
 
     while ((buf = prompt(env)) != NULL) {
+        buf = preprocess(buf, env);
         if (strcmp("q", buf) == 0) {
             free(buf);
             break;
         }
-        buf = preprocess(buf, env);
         if (buf[0] == '\0') {
             free(buf);
             continue;
diff --git a/src/plfunc/pc.c b/src/plfunc/pc.c
index 96fc91b..eb8f35b 100644
--- a/src/plfunc/pc.c
+++ b/src/plfunc/pc.c
@@ -73,6 +73,7 @@ Object readFileToObject(Object* params, unused int length, unused struct Environ
 
     Object string = newObject(TYPE_STRING);
     string.string = readFileToString(file);
+    fclose(file);
     return string;
 }