<s>
In	O
the	O
theory	O
of	O
programming	O
languages	O
in	O
computer	B-General_Concept
science	I-General_Concept
,	O
deforestation	B-Application
(	O
also	O
known	O
as	O
fusion	O
)	O
is	O
a	O
program	B-Application
transformation	I-Application
to	O
eliminate	O
intermediate	O
lists	O
or	O
tree	B-Data_Structure
structures	I-Data_Structure
that	O
are	O
created	O
and	O
then	O
immediately	O
consumed	O
by	O
a	O
program	O
.	O
</s>
<s>
The	O
term	O
"	O
deforestation	B-Application
"	O
was	O
originally	O
coined	O
by	O
Philip	O
Wadler	O
in	O
his	O
1990	O
paper	O
"	O
Deforestation	B-Application
:	O
transforming	O
programs	O
to	O
eliminate	O
trees	O
"	O
.	O
</s>
<s>
Deforestation	B-Application
is	O
typically	O
applied	O
to	O
programs	O
in	O
functional	B-Language
programming	I-Language
languages	I-Language
,	O
particularly	O
non-strict	B-Application
programming	I-Application
languages	I-Application
such	O
as	O
Haskell	B-Language
.	O
</s>
<s>
One	O
particular	O
algorithm	O
for	O
deforestation	B-Application
,	O
shortcut	O
deforestation	B-Application
,	O
is	O
implemented	O
in	O
the	B-Application
Glasgow	I-Application
Haskell	I-Application
Compiler	I-Application
.	O
</s>
<s>
Deforestation	B-Application
is	O
closely	O
related	O
to	O
escape	O
analysis	O
.	O
</s>
