<s>
Hugs	B-Application
(	O
Haskell	B-Language
User	O
's	O
Gofer	B-Application
System	O
)	O
,	O
also	O
Hugs	B-Application
98	I-Application
,	O
is	O
a	O
bytecode	O
interpreter	B-Application
for	O
the	O
functional	B-Language
programming	I-Language
language	I-Language
Haskell	B-Language
.	O
</s>
<s>
Hugs	B-Application
is	O
the	O
successor	O
to	O
Gofer	B-Application
,	O
and	O
was	O
originally	O
derived	O
from	O
Gofer	B-Application
version	O
2.30b	O
.	O
</s>
<s>
Hugs	B-Application
and	O
Gofer	B-Application
were	O
originally	O
developed	O
by	O
Mark	O
P	O
.	O
Jones	O
,	O
now	O
a	O
professor	O
at	O
Portland	O
State	O
University	O
.	O
</s>
<s>
Hugs	B-Application
comes	O
with	O
a	O
simple	O
graphics	O
library	O
.	O
</s>
<s>
As	O
a	O
complete	O
Haskell	B-Language
implementation	O
that	O
is	O
portable	B-Architecture
and	O
simple	O
to	O
install	O
,	O
Hugs	B-Application
is	O
sometimes	O
recommended	O
for	O
new	O
Haskell	B-Language
users	O
.	O
</s>
<s>
Hugs	B-Application
deviates	O
from	O
the	O
Haskell	B-Language
98	I-Language
specification	O
in	O
several	O
minor	O
ways	O
.	O
</s>
<s>
For	O
example	O
,	O
Hugs	B-Application
does	O
not	O
support	O
mutually	O
recursive	O
modules	O
.	O
</s>
<s>
The	O
Hugs	B-Application
prompt	O
(	O
a	O
Haskell	B-Language
REPL	B-Application
)	O
accepts	O
expressions	O
for	O
evaluation	O
,	O
but	O
not	O
module	O
,	O
type	O
or	O
function	O
definitions	O
.	O
</s>
<s>
Hugs	B-Application
can	O
load	O
Haskell	B-Language
modules	O
at	O
start-up	O
.	O
</s>
<s>
An	O
example	O
of	O
"	O
Typed	O
records	O
with	O
extensibility	O
"	O
,	O
a	O
non	O
standard	O
feature	O
unique	O
to	O
Hugs	B-Application
.	O
</s>
