[project @ 2001-10-03 13:58:50 by simonpj]
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Clear up infelicities
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CorePrep, CoreUtils, SimplUtils
LiberateCase (wibbles only)
* Previously CorePrep was floating LocalIds to top level, which
breaks the invariant that after CorePrep all top level Ids are
GlobalIds. But it didn't really need to, and this pass makes it
so. It's much tidier now.
* Make CorePrep do eta expansion on partial applications
x = foldr f y ==> x = \ys -> foldr f y ys
(This used to be done in the simplifier, but now the
simplifier only eta expands where there is at least one
lambda already.)
* Omit CoreUtils.etaReduce. (Never called.)
* Improve CoreUtils.etaExpand, so that it doesn't add gratuitous
beta redexes.