break break ck_null 0
continue continue ck_null 0
-#nswitch numeric switch ck_null d
-#cswitch character switch ck_null d
-
# I/O.
open open ck_open ismt@ F S? L
# For multi-threading
lock lock ck_rfun s% R
+# For state support
+
+once once ck_null |
+
custom unknown custom operator ck_null 0