For single-method classes use newtypes
authorsimonpj@microsoft.com <unknown>
Mon, 1 Nov 2010 08:07:36 +0000 (08:07 +0000)
committersimonpj@microsoft.com <unknown>
Mon, 1 Nov 2010 08:07:36 +0000 (08:07 +0000)
This clears up an awkward hack for exprIsConApp_maybe, and
works better too.  See Note [Single-method classes] in
TcInstDcls.


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