<s>
MTASC	B-Operating_System
(	O
Motion-Twin	O
ActionScript	B-Operating_System
2	O
Compiler	B-Language
)	O
is	O
an	O
ActionScript	B-Operating_System
2.0	O
compiler	B-Language
written	O
in	O
the	O
OCaml	B-Language
programming	I-Language
language	I-Language
by	O
the	O
company	O
Motion	O
Twin	O
.	O
</s>
<s>
It	O
is	O
free	B-Application
software	I-Application
and	O
can	O
be	O
used	O
alone	O
or	O
with	O
other	O
tools	O
like	O
swfmill	B-Operating_System
to	O
produce	O
SWF	O
files	O
,	O
which	O
contain	O
interactive	O
multimedia	O
content	O
playable	O
with	O
the	O
Flash	B-Operating_System
Player	I-Operating_System
.	O
</s>
<s>
MTASC	B-Operating_System
is	O
also	O
much	O
faster	O
than	O
the	O
Adobe	B-Operating_System
Flash	I-Operating_System
ActionScript	B-Operating_System
compiler	B-Language
.	O
</s>
<s>
MTASC	B-Operating_System
is	O
built	O
with	O
optimizing	O
OCaml	B-Language
compilers	B-Language
,	O
and	O
thus	O
provides	O
a	O
speed	O
improvement	O
over	O
the	O
Macromedia	O
Compiler	B-Language
(	O
MMC	O
)	O
.	O
</s>
<s>
MTASC	B-Operating_System
corrects	O
several	O
safety	O
problems	O
that	O
occur	O
when	O
using	O
MMC	O
.	O
</s>
<s>
The	O
MTASC	B-Operating_System
compiler	B-Language
is	O
stricter	O
than	O
MMC	O
and	O
can	O
detect	O
more	O
errors	O
than	O
MMC	O
;	O
because	O
of	O
this	O
strictness	O
,	O
there	O
are	O
some	O
differences	O
between	O
MMC	O
and	O
MTASC	B-Operating_System
.	O
</s>
<s>
MTASC	B-Operating_System
is	O
not	O
compatible	O
with	O
ActionScript	B-Operating_System
2.0	O
in	O
the	O
local	O
variables	O
scoping	O
,	O
local	O
function	O
definitions	O
,	O
etc	O
.	O
</s>
<s>
MTASC	B-Operating_System
will	O
not	O
support	O
ActionScript	B-Operating_System
3.0	O
,	O
which	O
is	O
supported	O
by	O
its	O
successor	O
,	O
Haxe	B-Language
.	O
</s>
