Limbo includes a small, yet complete, set of reserved words. The following identifiers are reserved for use as keywords and may not be used otherwise:
adt | alt | array | big | break |
byte | case | chan | con | continue |
cyclic | do | else | exit | fn |
for | hd | if | implement | import |
include | int | len | list | load |
module | nil | of | or | pick |
real | ref | return | self | spawn |
string | tagof | tl | to | type |
while |