diff --git a/moo/lib/exec.c b/moo/lib/exec.c
index 22b7d64..5baa007 100644
--- a/moo/lib/exec.c
+++ b/moo/lib/exec.c
@@ -3082,38 +3082,6 @@ static moo_pfrc_t pf_system_log (moo_t* moo, moo_ooi_t nargs)
 	return MOO_PF_SUCCESS;
 }
 
-static moo_pfrc_t pf_system_collect_garbage (moo_t* moo, moo_ooi_t nargs)
-{
-	moo_gc (moo);
-	MOO_STACK_SETRETTORCV (moo, nargs);
-	return MOO_PF_SUCCESS;
-}
-
-static moo_pfrc_t pf_system_pop_collectable (moo_t* moo, moo_ooi_t nargs)
-{
-	if (moo->collectable.first)
-	{
-		moo_finalizable_t* first;
-
-		first = moo->collectable.first;
-
-		/* TODO: if it's already fininalized, delete it from collectable */
-		MOO_ASSERT (moo, MOO_OOP_IS_POINTER(first->oop));
-		MOO_ASSERT (moo, MOO_OBJ_GET_FLAGS_GCFIN(first->oop) & MOO_GCFIN_FINALIZABLE);
-
-		MOO_STACK_SETRET (moo, nargs, first->oop);
-		MOO_OBJ_SET_FLAGS_GCFIN (first->oop, MOO_OBJ_GET_FLAGS_GCFIN(first->oop) | MOO_GCFIN_FINALIZED);
-
-		MOO_DELETE_FROM_LIST (&moo->collectable, first);
-		moo_freemem (moo, first); /* TODO: move it to the free list instead... */
-	}
-	else
-	{
-		MOO_STACK_SETRETTOERROR (moo, nargs, MOO_ENOENT);
-	}
-	return MOO_PF_SUCCESS;
-}
-
 
 
 static void sprintptr (moo_ooch_t* nbuf, moo_oow_t num, moo_oow_t *lenp)
@@ -3277,7 +3245,7 @@ static pf_t pftab[] =
 
 	{ "System_calloc",                         { moo_pf_system_calloc,                    1, 1 } },
 	{ "System_calloc:",                        { moo_pf_system_calloc,                    1, 1 } },
-	{ "System_collectGarbage",                 { pf_system_collect_garbage,               0, 0 } },
+	{ "System_collectGarbage",                 { moo_pf_system_collect_garbage,           0, 0 } },
 	{ "System_free",                           { moo_pf_system_free,                      1, 1 } },
 	{ "System_free:",                          { moo_pf_system_free,                      1, 1 } },
 	{ "System_getBytes",                       { moo_pf_system_get_bytes,                 5, 5 } },
@@ -3292,7 +3260,7 @@ static pf_t pftab[] =
 	{ "System_log",                            { pf_system_log,                           2, MA } },
 	{ "System_malloc",                         { moo_pf_system_malloc,                    1, 1 } },
 	{ "System_malloc:",                        { moo_pf_system_malloc,                    1, 1 } },
-	{ "System_popCollectable",                 { pf_system_pop_collectable,               0, 0 } },
+	{ "System_popCollectable",                 { moo_pf_system_pop_collectable,           0, 0 } },
 	{ "System_putBytes",                       { moo_pf_system_put_bytes,                 5, 5 } },
 	{ "System_putInt8",                        { moo_pf_system_put_int8,                  3, 3 } },
 	{ "System_putInt16",                       { moo_pf_system_put_int16,                 3, 3 } },
diff --git a/moo/lib/logfmt.c b/moo/lib/logfmt.c
index ca765a3..cbd6e4c 100644
--- a/moo/lib/logfmt.c
+++ b/moo/lib/logfmt.c
@@ -563,7 +563,7 @@ static void print_object (moo_t* moo, moo_oow_t mask, moo_oop_t oop, outbfmt_t o
 		}
 		else
 		{
-			outbfmt (moo, mask, "instance of %.*js(%p)", MOO_OBJ_GET_SIZE(c->name), ((moo_oop_char_t)c->name)->slot, oop);
+			outbfmt (moo, mask, "<<%.*js>>", MOO_OBJ_GET_SIZE(c->name), ((moo_oop_char_t)c->name)->slot);
 		}
 	}
 }
diff --git a/moo/lib/moo-prv.h b/moo/lib/moo-prv.h
index bbb9c3b..cfc0f65 100644
--- a/moo/lib/moo-prv.h
+++ b/moo/lib/moo-prv.h
@@ -1331,7 +1331,6 @@ moo_pfrc_t moo_pf_system_calloc (moo_t* moo, moo_ooi_t nargs);
 moo_pfrc_t moo_pf_system_free (moo_t* moo, moo_ooi_t nargs);
 moo_pfrc_t moo_pf_smptr_free (moo_t* moo, moo_ooi_t nargs);
 
-
 moo_pfrc_t moo_pf_system_get_int8 (moo_t* moo, moo_ooi_t nargs);
 moo_pfrc_t moo_pf_system_get_int16 (moo_t* moo, moo_ooi_t nargs);
 moo_pfrc_t moo_pf_system_get_int32 (moo_t* moo, moo_ooi_t nargs);
@@ -1379,6 +1378,9 @@ moo_pfrc_t moo_pf_smptr_put_uint64 (moo_t* moo, moo_ooi_t nargs);
 moo_pfrc_t moo_pf_smptr_get_bytes (moo_t* moo, moo_ooi_t nargs);
 moo_pfrc_t moo_pf_smptr_put_bytes (moo_t* moo, moo_ooi_t nargs);
 
+moo_pfrc_t moo_pf_system_collect_garbage (moo_t* moo, moo_ooi_t nargs);
+moo_pfrc_t moo_pf_system_pop_collectable (moo_t* moo, moo_ooi_t nargs);
+
 /* TODO: remove the following debugging functions */
 /* ========================================================================= */
 /* debug.c                                                                   */
diff --git a/moo/lib/pf-sys.c b/moo/lib/pf-sys.c
index a372530..3678d9d 100644
--- a/moo/lib/pf-sys.c
+++ b/moo/lib/pf-sys.c
@@ -967,3 +967,40 @@ moo_pfrc_t moo_pf_smptr_put_bytes (moo_t* moo, moo_ooi_t nargs)
 	MOO_STACK_SETRET (moo, nargs, MOO_SMOOI_TO_OOP(len_in_buffer));
 	return MOO_PF_SUCCESS;
 }
+
+
+/* ------------------------------------------------------------------------------------- */
+
+moo_pfrc_t moo_pf_system_collect_garbage (moo_t* moo, moo_ooi_t nargs)
+{
+	moo_gc (moo);
+	MOO_STACK_SETRETTORCV (moo, nargs);
+	return MOO_PF_SUCCESS;
+}
+
+moo_pfrc_t moo_pf_system_pop_collectable (moo_t* moo, moo_ooi_t nargs)
+{
+	if (moo->collectable.first)
+	{
+		moo_finalizable_t* first;
+
+		first = moo->collectable.first;
+
+		/* TODO: if it's already fininalized, delete it from collectable */
+		MOO_ASSERT (moo, MOO_OOP_IS_POINTER(first->oop));
+		MOO_ASSERT (moo, MOO_OBJ_GET_FLAGS_GCFIN(first->oop) & MOO_GCFIN_FINALIZABLE);
+
+		MOO_STACK_SETRET (moo, nargs, first->oop);
+		MOO_OBJ_SET_FLAGS_GCFIN (first->oop, MOO_OBJ_GET_FLAGS_GCFIN(first->oop) | MOO_GCFIN_FINALIZED);
+
+		MOO_DELETE_FROM_LIST (&moo->collectable, first);
+		moo_freemem (moo, first); /* TODO: move it to the free list instead... */
+	}
+	else
+	{
+		/*MOO_STACK_SETRET (moo, nargs, moo->_nil);*/
+		MOO_STACK_SETRETTOERROR (moo, nargs, MOO_ENOENT);
+	}
+
+	return MOO_PF_SUCCESS;
+}