patch applied (ghc): Fix a nasty bug in RULE matching: Trac #4814
Simon Peyton Jones
simonpj at microsoft.com
Thu Dec 2 13:36:13 CET 2010
Thu Dec 2 02:26:18 PST 2010 simonpj at microsoft.com
* Fix a nasty bug in RULE matching: Trac #4814
See Note [Matching lets], which explains it all in detail.
It took me a day to think of a nice way to fix the bug,
but I think the result is quite respectable. Subtle, though.
M ./compiler/basicTypes/VarEnv.lhs -4 +6
M ./compiler/coreSyn/CoreSubst.lhs -3 +25
M ./compiler/specialise/Rules.lhs -178 +234
View patch online:
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