<s>
KRC	O
(	O
Kent	B-Language
Recursive	I-Language
Calculator	I-Language
)	O
is	O
a	O
lazy	O
functional	B-Language
language	I-Language
developed	O
by	O
David	O
Turner	O
from	O
November	O
1979	O
to	O
October	O
1981	O
based	O
on	O
SASL	B-Language
,	O
with	O
pattern	B-Language
matching	I-Language
,	O
guards	O
and	O
ZF	B-Language
expressions	I-Language
(	O
now	O
more	O
usually	O
called	O
list	B-Language
comprehensions	I-Language
)	O
.	O
</s>
<s>
Two	O
implementations	O
of	O
KRC	O
were	O
written	O
:	O
David	O
Turner	O
's	O
original	O
one	O
in	O
BCPL	B-Language
running	O
on	O
EMAS	B-Application
,	O
and	O
Simon	O
J	O
.	O
Croft	O
's	O
later	O
one	O
in	O
C	B-Language
under	O
Unix	B-Application
,	O
and	O
KRC	O
was	O
the	O
main	O
language	O
used	O
for	O
teaching	O
functional	B-Language
programming	I-Language
at	O
the	O
University	O
of	O
Kent	O
at	O
Canterbury	O
(	O
UK	O
)	O
from	O
1982	O
to	O
1985	O
.	O
</s>
<s>
The	O
direct	O
successor	O
to	O
KRC	O
is	O
Miranda	B-Language
,	O
which	O
includes	O
a	O
polymorphic	O
type	O
discipline	O
based	O
on	O
that	O
of	O
Milner	O
's	O
ML	B-Language
.	O
</s>
