Wed Aug 20 05:07:51 PDT 2008 [EMAIL PROTECTED]
* Fix Trac #2456: eliminate duplicate bindings when deriving
Condsider deriving two overlapping Data declarations for the same type
deriving instance Data (T A)
deriving instance Data (T B)
We were getting duplicate bindings for the data-con and tycon auxiliary
bindings for T. This patch fixes the problem by doing these two decls
the same way as we do con2tag etc.
(Why might you want such instances; see Trac #2456.)
M ./compiler/typecheck/TcGenDeriv.lhs -42 +43
View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20080820120751-1287e-821243b74dbfb68e071067011af54256e670d22e.gz
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