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A number of words are reserved by LUX to indicate certain LUX language features. The list of reserved words is the following:
and, andif, begin, block, break,
case, compileif, continue, do,
else, end, endblock, endcase,
endcif, endfunc, endsubr, eq, for,
func, ge, gt, if, le, lt,
mod, ncase, ne, or, orif,
repeat, retall, return, run, smod,
subr, then, until, while, xor
These words (in any combination of upper case and lower case letters)
cannot be used as names for variables, user-defined subroutines, or
functions, and will generate errors when used as such. They can be used
as part of literal strings (i.e., t,'break' is OK; t,break
is not).
In addition, the words ignore and resume are similarly
reserved if they occur as the first word on a line. They can be used as
named for variables or routines as long as they do not appear as the
first word on a line. See Ignoring Input for more information.