<s>
Hope	O
is	O
a	O
small	O
functional	B-Language
programming	I-Language
language	I-Language
developed	O
in	O
the	O
1970s	O
at	O
the	O
University	O
of	O
Edinburgh	O
.	O
</s>
<s>
It	O
predates	O
Miranda	B-Language
and	O
Haskell	B-Language
and	O
is	O
contemporaneous	O
with	O
ML	B-Language
,	O
also	O
developed	O
at	O
the	O
University	O
.	O
</s>
<s>
Hope	O
was	O
derived	O
from	O
NPL	B-Language
,	O
a	O
simple	O
functional	B-Language
language	I-Language
developed	O
by	O
Rod	O
Burstall	O
and	O
John	O
Darlington	O
in	O
their	O
work	O
on	O
program	O
transformation	O
.	O
</s>
<s>
NPL	B-Language
and	O
Hope	O
are	O
notable	O
for	O
being	O
the	O
first	O
languages	O
with	O
call-by-pattern	O
evaluation	O
and	O
algebraic	O
data	O
types	O
.	O
</s>
<s>
A	O
successor	O
language	O
Hope+	B-Language
(	O
developed	O
jointly	O
between	O
Imperial	O
College	O
and	O
International	O
Computers	O
Limited	O
(	O
ICL	O
)	O
added	O
annotations	O
to	O
dictate	O
either	O
strict	O
or	O
lazy	O
evaluation	O
.	O
</s>
<s>
Roger	O
Bailey	O
's	O
Hope	O
tutorial	O
in	O
the	O
August	O
1985	O
issue	O
of	O
BYTE	O
references	O
an	O
interpreter	O
for	O
IBM	B-Operating_System
PC	I-Operating_System
DOS	I-Operating_System
2.0	O
.	O
</s>
