diff --git a/src/lisp/Jmk2 b/src/lisp/Jmk2
index 2fc98d4..a54cd87 100644
--- a/src/lisp/Jmk2
+++ b/src/lisp/Jmk2
@@ -36,7 +36,7 @@
 
 rule valgrind [pwd]/lisp {
 	log VALGRIND "lisp test-gc.lisp"
-	shell "LISP_LIBRARY_PATH=$::lisp_libpath valgrind --track-origins=yes --leak-check=full --show-leak-kinds=all ./lisp test-gc.lisp"
+	shell "LISP_LIBRARY_PATH=$::lisp_libpath valgrind --track-origins=yes --leak-check=full --show-leak-kinds=all ./lisp quicksort.lisp"
 }
 
 srcs main.c lisp.c compiler.c lib/std.c plat/linux.c istream.c gc.c \
diff --git a/src/lisp/compiler.dasc b/src/lisp/compiler.dasc
index 6549ecc..0a01079 100644
--- a/src/lisp/compiler.dasc
+++ b/src/lisp/compiler.dasc
@@ -488,6 +488,7 @@
 		}
 		else
 		{
+			// tail of the list
 			| push nil;
 
 			for (int i = n - 1; i >= 0; i--)
@@ -693,6 +694,7 @@
 			NEARVAL(binding);
 			if (length(binding) != 2)
 			{
+				printval(args, 0);
 				THROW(EARGS, "Binding list in let1 must contain exactly two entries");
 			}
 
diff --git a/src/lisp/lisp.c b/src/lisp/lisp.c
index 6299e03..8002319 100644
--- a/src/lisp/lisp.c
+++ b/src/lisp/lisp.c
@@ -603,12 +603,12 @@
 
 void del_alloc(struct alloc *alloc)
 {
-	if (alloc->type_tag == CLOSURE_TAG)
-	{
-		fprintf(stderr, "del_alloc closure\n");
-		struct closure_alloc *ca = alloc;
-		free(ca->closure.args);
-	}
+	/* if (alloc->type_tag == CLOSURE_TAG) */
+	/* { */
+	/* 	fprintf(stderr, "del_alloc closure\n"); */
+	/* 	struct closure_alloc *ca = alloc; */
+	/* 	free(ca->closure.args); */
+	/* } */
 
 	free_aligned(alloc);
 }
@@ -723,17 +723,20 @@
 	}
 }
 
-value_t *nilptr(value_t val)
+value_t *nilptr(value_t *val)
 {
-	if (!listp(val))
+	if (!val)
 		return NULL;
 
-	if (nilp(val))
+	if (!listp(*val))
 		return NULL;
 
+	if (nilp(*val))
+		return val;
+
 	value_t *p;
 
-	for (p = cdrref(val); !nilp(*p); p = cdrref(*p))
+	for (p = cdrref(*val); !nilp(*p); p = cdrref(*p))
 	{
 	}
 
@@ -748,7 +751,7 @@
 	if (listp(front) && !listp(back))
 		back = cons(back, nil);
 
-	*nilptr(front) = back;
+	*nilptr(&front) = back;
 
 	return front;
 }
diff --git a/src/lisp/lisp.h b/src/lisp/lisp.h
index ad7314a..c5cb398 100644
--- a/src/lisp/lisp.h
+++ b/src/lisp/lisp.h
@@ -83,6 +83,18 @@
 	value_t data[];
 };
 
+struct class
+{
+	// A symbol representing the name of the class this is an instance
+	// of.
+	value_t type;
+
+	int num_members;
+	// C data
+	void *cdata;
+	value_t members[];
+};
+
 /// Default pool (no pool)
 #define NO_POOL 0
 
@@ -131,6 +143,12 @@
 	struct closure closure;
 };
 
+struct class_alloc
+{
+	struct alloc alloc;
+	struct class class;
+};
+
 /**
  * Create a new allocation pool.
  */
@@ -181,7 +199,7 @@
 value_t cdr(value_t v);
 /// Return a pointer to the "nil" tail of the list, or NULL if you do
 /// something stupid.
-value_t *nilptr(value_t val);
+value_t *nilptr(value_t *val);
 value_t *carref(value_t v);
 value_t *cdrref(value_t v);
 /// @returns the `index`-th `cdr`
diff --git a/src/lisp/lispbugs b/src/lisp/lispbugs
deleted file mode 100644
index 67ac030..0000000
--- a/src/lisp/lispbugs
+++ /dev/null
@@ -1,8 +0,0 @@
-BUG: "random" segfault in lisp (gc) calls.
-
-Theory: the values we're walking on the stack are garbage, i.e. coming
-from C.
-
-Looks like the GCSegments code got lost, I need to readd that and it
-should fix this. `eval' in `compiler.dasc' is getting it's local
-variables inspected by _do_gc.
\ No newline at end of file
diff --git a/src/lisp/main.c b/src/lisp/main.c
index 96a2f8e..6205bd1 100644
--- a/src/lisp/main.c
+++ b/src/lisp/main.c
@@ -2,25 +2,41 @@
 #include "gc.h"
 #include "lisp.h"
 #include "plat/plat.h"
+#include "lib/std.h"
+#include <stdlib.h>
 
 int main(int argc, char **argv)
 {
 	gc_push_segment(NULL, 0);
 	
-	if (argc < 2)
-	{
-		puts("pass the program you want to run as the first argument please");
-		return 1;
-	}
-
-	bool ok;
 	struct environment *env = NULL;
 	struct error compile_error;
-	if (!IS_OKAY((compile_error = compile_file(argv[1], &env))))
+
+	if (argc < 2)
 	{
-		ereport(compile_error);
-		goto done;
+		env = malloc(sizeof(struct environment));
+		env->first = NULL;
+		env->first_loaded = NULL;
+
+		if (!IS_OKAY((compile_error = load_std(env))))
+		{
+			ereport(compile_error);
+			goto done;
+		}
+
+		if (!load_library(env, "repl"))
+			goto done;
 	}
+	else
+	{
+		if (!IS_OKAY((compile_error = compile_file(argv[1], &env))))
+		{
+			ereport(compile_error);
+			goto done;
+		}
+	}
+
+	
 
 	struct function *lisp_main_f = find_function(env, "main");