darcs patch: Fix warnings (part 1)

[Twan van Laarhoven]

Hi,

I have been fixing warnings in the GHC source code. I have NOT fixed 'incomplete 
pattern match' warnings in these patches, instead files with warnings of that 
type now say

   {-# OPTIONS -fno-warn-incomplete-patterns #-}

instead of

   {-# OPTIONS -w #-}

Many of those warnings are not real errors, but some notable things have come up:

   - hsSyn/HsPat.lhs:415:4:
       In the definition of `go1': Patterns not matched: QuasiQuotePat _

   - hsSyn/HsDecls.lhs:714:0:
       In the definition of `pprConDecl':
             Patterns not matched:
                   ConDecl _ _ _ _ (InfixCon _ _) (ResTyGADT _) _

   - types/Unify: unused binding of 'subst1' (see other message)

Twan
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