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(parent: 5c2ecdf) | patch
Improve the handling of deriving, in error cases
authorsimonpj@microsoft.com <unknown>
Wed, 20 Jun 2007 10:28:28 +0000 (10:28 +0000)
committersimonpj@microsoft.com <unknown>
Wed, 20 Jun 2007 10:28:28 +0000 (10:28 +0000)
commitf6a741fad12b14b102be1aca959b8d63cbb2734a
tree75d52a71f956e3e60842e78f857abf60f9cd3131tree | snapshot
parent5c2ecdff9b9e814c2549da0b3efd61d5107c72d6commit | diff
Improve the handling of deriving, in error cases

I'd been too ambitious with error handling for 'deriving', and got it
entirely wrong.  This fixes it.  See extensive
Note [Exotic derived instance contexts]
in TcSimplify.  (Most of the extra lines are comments!)
compiler/typecheck/TcDeriv.lhs diff | blob | history
compiler/typecheck/TcSimplify.lhs diff | blob | history
Glasgow Haskell Compiler with heterogeneous metaprogramming (generalized arrows and modal types)