Wed Oct 10 02:33:34 PDT 2007 [EMAIL PROTECTED]
* FIX: tidy up TcSimplify following equality constraints additions
The combination of "type refinement" for GADTs and the new equality
constraints has made TcSimplify rather complicated. And wrong:
it generated bogus code for cholewo-eval.
This patch is still far from entirely satisfactory. There are
too many places where invariants are unclear, and the code is
still a bit of a mess. But I believe it's better, and it passes
the regression tests! So I think it's good enough for the 6.8 release.
Please merge.
The main changes are:
- get rid of extractLocalResults (which was always suspicious)
- instead, treat the 'refinement' along with 'givens', by
adding a field to RedEnv, red_reft which travels with red_givens
- I also reworked extractResults a bit, which looked wrong to me
This entailed changing the Given constructor in Avail to take
an Inst rather than a TcId
M ./compiler/typecheck/TcSimplify.lhs -98 +112
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