options:

l:	local extensions enabled
n:	no register messages
s:	symmetric range for integers: MIN(INTEGER) = -MAX(INTEGER)
w:	disable warnings
x:	make every name global (for ADB)
A:	extra array bound checks
I:	look in directory for definition modules
L:	no FIL/LIN instructions
M:	maximum identifier length
R:	runtime checks
U:	allow underscores in identifiers
V:	object sizes and alignments
W:	enable warnings
3:	strict 3rd edition Modula-2
-:	to pass debugging options

Debugging options:

i:	display number of structures allocated and number of lines read
t:	run lexical analyzer only
C:	dump of constant expressions
F:	display size of every file read.
S:	define/lookup symbol table access dump
X:	parse-tree dump

