Commits on Jan 10, 2020

1. Fix source spans for multi-clause definitions …

   Currently, we use the source span of the match which corresponds to
   the whole clause instead of just the function identifier. This
   resulted in us pointing every goto definition request within a clause
   to the function if there is no other information (either because it
   failed because it came from an external package or simply because you
   are not on an identifier).
   
   This PR fixes this by getting the proper source spans frmo the
   HsMatchContext. Somewhat annoyingly, we have to get it from the parsed
   module since GHC messes this up during typechecking but it’s
   reasonably simple.

   

   cocreature committed Jan 10, 2020
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2. fix ancient GHC

   

   cocreature committed Jan 10, 2020
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3. fix comment

   

   cocreature committed Jan 10, 2020
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