Wed Nov 1 04:21:20 PST 2006 [EMAIL PROTECTED]
* Fix error reporting for contexts during deriving (Trac 958)
When doing the fixpoint iteration for 'deriving' we have to be careful
not to end up in a loop, even if we have -fallow-undecidable-instances.
Test is tcfail169
M ./compiler/typecheck/TcDeriv.lhs -9 +4
M ./compiler/typecheck/TcMType.lhs -15 +16
M ./compiler/typecheck/TcSimplify.lhs -10 +37
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