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Ensure exprIsCheap/exprIsExpandable deal with Cast properly
authorsimonpj@microsoft.com <unknown>
Tue, 15 Feb 2011 14:36:55 +0000 (14:36 +0000)
committersimonpj@microsoft.com <unknown>
Tue, 15 Feb 2011 14:36:55 +0000 (14:36 +0000)
This bug was causing a Lint error on the stable branch. For some
reason it doesn't show up in HEAD, but it's still worth fixing.

The point is that ((f `cast` co) a) is cheap if f has arity>1.
This was being gratuitously missed before.


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Glasgow Haskell Compiler with heterogeneous metaprogramming (generalized arrows and modal types)