[GHC] #12220: TypeApplications and DefaultSignatures - problems deducing type variables.

[GHC]

#12220: TypeApplications and DefaultSignatures - problems deducing type variables.
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        Reporter:  mkloczko          |                Owner:
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
                                     |  DefaultSignatures, TypeApplications
Operating System:  Linux             |         Architecture:  x86_64
                                     |  (amd64)
 Type of failure:  None/Unknown      |            Test Case:
                                     |  generics/T12220
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 This isn't quite non-invasive, since it's causing some packages to fail to
 compile on GHC HEAD that were compiling on GHC 8.0.1. See #12466.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12220#comment:3>
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