<s>
LIL	O
,	O
the	O
Little	B-Operating_System
Implementation	I-Operating_System
Language	I-Operating_System
,	O
was	O
a	O
system	O
programming	O
language	O
during	O
the	O
early	O
days	O
of	O
Unix	B-Application
history	O
on	O
PDP-11	B-Device
machines	O
.	O
</s>
<s>
LIL	O
attempted	O
to	O
fill	O
the	O
gap	O
between	O
assemblers	O
and	O
machine-independent	O
system	O
implementation	O
languages	O
(	O
such	O
as	O
the	O
C	B-Language
programming	I-Language
language	I-Language
)	O
,	O
by	O
basically	O
adding	O
structured	O
programming	O
to	O
the	O
PDP-11	B-Device
assembly	O
language	O
.	O
</s>
<s>
LIL	O
resembled	O
PL360	B-Language
with	O
C-like	O
flow	O
control	O
syntax	O
.	O
</s>
<s>
The	O
LIL	O
compiler	O
"	O
lc	O
"	O
was	O
part	O
of	O
Fifth	O
Edition	O
Unix	B-Application
(	O
1974	O
)	O
,	O
but	O
was	O
dropped	O
by	O
Sixth	B-Operating_System
Edition	I-Operating_System
Unix	I-Operating_System
(	O
1975	O
)	O
.	O
</s>
<s>
Plauger	O
explains	O
why	O
LIL	O
was	O
abandoned	O
in	O
Bell	O
Labs	O
in	O
favor	O
of	O
C	B-Language
:	O
</s>
<s>
Its	O
stiffest	O
competition	O
at	O
Bell	O
Labs	O
is	O
the	O
language	O
C	B-Language
,	O
which	O
is	O
higher	O
level	O
,	O
and	O
machine	O
independent	O
.	O
</s>
<s>
Every	O
time	O
it	O
looked	O
like	O
C	B-Language
was	O
too	O
expensive	O
to	O
use	O
for	O
a	O
particular	O
project	O
,	O
LIL	O
was	O
considered	O
.	O
</s>
<s>
But	O
almost	O
every	O
time	O
,	O
it	O
proved	O
easier	O
(	O
and	O
more	O
rewarding	O
)	O
to	O
improve	O
C	B-Language
,	O
or	O
its	O
runtime	O
support	O
,	O
or	O
the	O
hardware	O
,	O
than	O
to	O
invest	O
time	O
in	O
yet	O
another	O
language	O
.	O
</s>
<s>
...	O
it	O
looks	O
like	O
the	O
little	B-Operating_System
implementation	I-Operating_System
language	I-Operating_System
is	O
an	O
idea	O
whose	O
time	O
as	O
come	O
--	O
and	O
gone	O
.	O
</s>
