[GHC] #12406: New not-in-scope behaviour + deferred typed holes = disappearing error messages

[GHC]

#12406: New not-in-scope behaviour + deferred typed holes = disappearing error
messages
-------------------------------------+-------------------------------------
        Reporter:  ertes             |                Owner:  ak3n
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12170            |  Differential Rev(s):  Phab:D2451
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"efc0372a157eadeee58bbada77c64d53590e04af/ghc"
 efc0372a/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="efc0372a157eadeee58bbada77c64d53590e04af"
 Not-in-scope variables are always errors

 This fixes Trac #12406.  A not-in-scope error shoudl be an error
 even if you have -fdefer-typed-holes.
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12406#comment:6>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler