[GHC] #14963: ghci -fdefer-type-errors can't run IO action from another module

[GHC]

#14963: ghci -fdefer-type-errors can't run IO action from another module
-------------------------------------+-------------------------------------
        Reporter:  elaforge          |                Owner:  tdammers
            Type:  bug               |               Status:  patch
        Priority:  high              |            Milestone:  8.4.2
       Component:  GHCi              |              Version:  8.4.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  ghci/should_run/T14963
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  D4833
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by tdammers):

 * testcase:   => ghci/should_run/T14963
 * status:  new => patch
 * differential:   => D4833


Comment:

 I have put up a patch (https://phabricator.haskell.org/D4833), however it
 turns out that while disabling these three flags for interactive
 statements avoids the panic, it also seems to break a number of other
 tests.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14963#comment:32>
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