<s>
StaDyn	B-Language
is	O
an	O
object-oriented	B-Language
general-purpose	O
programming	O
language	O
for	O
the	O
.NET	B-Application
platform	I-Application
that	O
supports	O
both	O
static	O
and	O
dynamic	O
typing	O
in	O
the	O
same	O
programming	O
language	O
.	O
</s>
<s>
The	O
StaDyn	B-Language
compiler	O
gathers	O
type	O
information	O
for	O
the	O
dynamically	O
typed	O
code	O
.	O
</s>
<s>
Its	O
first	O
prototype	O
appeared	O
in	O
2007	O
,	O
as	O
a	O
modification	O
of	O
C#	B-Application
3.0	O
.	O
</s>
<s>
Type	O
inference	O
was	O
supported	O
by	O
including	O
var	O
as	O
a	O
new	O
type	O
,	O
unlike	O
C#	B-Application
,	O
which	O
only	O
offers	O
var	O
to	O
define	O
initialized	O
local	O
variables	O
.	O
</s>
<s>
StaDyn	B-Language
is	O
designed	O
by	O
Francisco	O
Ortin	O
from	O
the	O
University	O
of	O
Oviedo	O
.	O
</s>
<s>
The	O
name	O
StaDyn	B-Language
is	O
a	O
portmanteau	O
of	O
static	O
and	O
dynamic	O
,	O
denoting	O
its	O
aim	O
to	O
provide	O
the	O
benefits	O
of	O
both	O
static	O
and	O
dynamic	O
typing	O
.	O
</s>
<s>
In	O
this	O
way	O
,	O
StaDyn	B-Language
provides	O
a	O
type-safe	O
static	O
duck-typing	O
system	O
.	O
</s>
<s>
The	O
type	O
information	O
gathered	O
by	O
StaDyn	B-Language
is	O
used	O
to	O
perform	O
significant	O
optimizations	O
in	O
the	O
generated	O
code	O
:	O
the	O
number	O
of	O
type	O
inspections	O
and	O
type	O
casts	O
are	O
reduced	O
,	O
reflection	O
is	O
avoided	O
,	O
frequent	O
types	O
are	O
cached	O
,	O
and	O
methods	O
with	O
constraints	O
are	O
specialized	O
.	O
</s>
<s>
Many	O
of	O
those	O
type	O
checks	O
are	O
undertaken	O
earlier	O
by	O
the	O
StaDyn	B-Language
compiler	O
.	O
</s>
<s>
A	O
detailed	O
evaluation	O
of	O
the	O
runtime	O
performance	O
of	O
StaDyn	B-Language
is	O
detailed	O
in	O
.	O
</s>
