have builtins return :nil when appropriate

1 files changed, 5 insertions, 5 deletions

diff --git a/neb/std/sys.py b/neb/std/sys.py
index 1bbc938..7ff5e56 100644
--- a/neb/std/sys.py
+++ b/neb/std/sys.py
@@ -31,10 +31,10 @@ SYS.register("$", shell_multi)
 def interpretExit(symbol, args, env, ns):
     status = 0 if len(args) == 0 else args[0].value
     sys.exit(status)
-    return List([])
+    return Nil()
 
-exit_func = Builtin("exit", interpretExit, [], return_type=Type(":list"))
-exit_status_func = Builtin("exit", interpretExit, [Arg("status", TypeEnum.INT)], return_type=Type(":list"))
+exit_func = Builtin("exit", interpretExit, [], return_type=Type(":nil"))
+exit_status_func = Builtin("exit", interpretExit, [Arg("status", TypeEnum.INT)], return_type=Type(":nil"))
 exit_multi = MultiFunction("exit")
 exit_multi.register(exit_func)
 exit_multi.register(exit_status_func)
@@ -42,9 +42,9 @@ SYS.register("exit", exit_multi)
 
 def interpretPrint(symbol, args, env, ns):
     print(args[0].value)
-    return List([])  # print returns nothing
+    return Nil()
 
-print_func = Builtin("print", interpretPrint, [Arg("arg", TypeEnum.STRING)], return_type=Type(":list"))
+print_func = Builtin("print", interpretPrint, [Arg("arg", TypeEnum.STRING)], return_type=Type(":nil"))
 print_multi = MultiFunction("print")
 print_multi.register(print_func)
 SYS.register("print", print_multi)