Fri Aug 21 14:07:00 PDT 2009 [email protected]
* Fix Trac #3423: missed instantiation for newtype-derived instances
Ignore-this: 73fa66b45a9affe5b4e0276551e5861f
Somehow I'd forgotten to instantiate the coercion that is stored in a
'NewtypeDerived' constructor in an InstInfo. The necessary code is
in TcInstDcls.tc_inst_decl2.
The result was ghc: panic! (the 'impossible' happened)
(GHC version 6.10.3 for x86_64-unknown-linux):
No match in record selector Var.tcTyVarDetails
because we were looking at an (uninstantiated) TyVar instead of
an (instantiated) TcTyVar.
M ./compiler/typecheck/TcDeriv.lhs +1
M ./compiler/typecheck/TcInstDcls.lhs -5 +12
View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20090821210700-1287e-a19d8c5c5d060167b61df3f580e1d62bae3c9728.gz
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