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Simon Peyton Jones authored
There are two main refactorings here 1. Move the uf_arity field out of CoreUnfolding into UnfWhen It's a lot tidier there. If I've got this right, no behaviour should change. 2. Define specUnfolding and use it in DsBinds and Specialise a) commons-up some shared code b) makes sure that Specialise correctly specialises DFun unfoldings (which it didn't before) The two got put together because both ended up interacting in the specialiser. They cause zero difference to nofib.
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