[GHC] #12906: GHC fails to typecheck Main module without main

[GHC]

#12906: GHC fails to typecheck Main module without main
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           Reporter:  dfeuer         |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Other
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Given a `Main` module without a `main` value, GHC 8 reports the missing
 `main` and then exits, without bothering to typecheck the rest of the
 module. Previous versions, I believe, had the more useful behavior of
 reporting type errors regardless.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12906>
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