Thu Oct 7 03:27:20 PDT 2010 [email protected]
* Fix Trac #4345: simplifier bug
This is another long-standing bug, in which there was a possibility
that a loop-breaker could lose its loop-breaker-hood OccInfo,
and then the simplifer re-simplified the expression. Result, either
non-termination or, in the case of #4345, an unbound identifier.
The fix is very simple, in Id.transferPolyIdInfo.
See Note [transferPolyIdInfo].
M ./compiler/basicTypes/Id.lhs -8 +25
View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20101007102720-1287e-5fe54035d79261301fcf4b7a7b67aad280f434fa.gz
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