Keywords
The following words are reserved words by the language and cannot be used as identifiers:
base break, case, catch, class, clone,
continue, const, default, delete, else, enum,
extends, for, foreach, function, if, in,
local, null, resume, return, switch, this,
throw, try, typeof, while, yield, constructor,
instanceof, true, ,false ,static
Source:
http://www.squirrel-lang.org/doc/squirrel3.html#d0e61