On Mon, 2004-09-06 at 10:57, Richard Jones wrote:

> Doesn't laziness often indicate a bug in the code?  ie.  You've
> written an expression in the program, but that expression is never
> used.  This is dead code, right?  Hence a bug?

But that dead code if executed eagerly will result
in a value stored in a variable which is never used.
So the code is still 'dead code' and still a bug
(assuming it is a bug) whether evaluation is eager
or lazy.

Actually the lazy case might make it easier to
track this down by adding a debugging print
in the expression -- in the eager case you get
a diagnostic but can't deduce the result is used,
in the lazy case you know the result is being used
when you get the diagnostic.

-- 
John Skaller, mailto:skaller@users.sf.net
voice: 061-2-9660-0850, 
snail: PO BOX 401 Glebe NSW 2037 Australia
Checkout the Felix programming language http://felix.sf.net



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