Arity is smaller than need be

Consider

h x = let f = case x of { True -> t1; False -> t2 }
          in (f,f)

where t1 and t2 have arity 1. You'd think that f should have arity 1, but it doesn't. (Reason: exprArity, used in Simplify.addNonRecWithUnf, doesn't look through the case.)

Fix this as part of the upcoming arity cleanup.

Simon

Trac metadata

Trac field	Value
Version	6.10.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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