<p dir="ltr">See the paper "copatterns" by andreas abel.</p>
<p dir="ltr">Cheers!</p>
<p dir="ltr">Atze</p>
<div class="gmail_quote">On Feb 18, 2015 6:04 AM, "Eugene Kirpichov" <<a href="mailto:ekirpichov@gmail.com">ekirpichov@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hello haskell-cafe,</div><div><br></div><div>Let me repost here a question I posted to cstheory stackexchange - in hopes that there are more type theory experts here.</div><div><br></div><a href="http://cstheory.stackexchange.com/questions/29518/type-systems-preventing-laziness-related-memory-leaks" target="_blank">http://cstheory.stackexchange.com/questions/29518/type-systems-preventing-laziness-related-memory-leaks</a><br><div><br></div><div><div>Perhaps the main source of performance problems in Haskell is when a program inadvertently builds up a thunk of unbounded depth - this causes both a memory leak and a potential stack overflow when evaluating. The classic example is defining sum = foldr (+) 0 in Haskell.</div><div><br></div><div>Are there any type systems which statically enforce lack of such thunks in a program using a lazy language?</div><div><br></div><div>Seems like this should be on the same order of difficulty as proving other static program properties using type system extensions, e.g. some flavors of thread safety or memory safety.</div><div><br></div></div></div>
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