[GHC] #15325: GHCi panic in getIdFromTrivialExpr with -fdefer-type-errors

[GHC]

#15325: GHCi panic in getIdFromTrivialExpr with -fdefer-type-errors
-------------------------------------+-------------------------------------
        Reporter:  dramforever       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by RyanGlScott):

 * cc: simonpj (added)


Comment:

 This is a regression from GHC 8.2.2, which did not exhibit this panic. The
 offending commit is 33452dfc6cf891b59d63fa9fe138b18cbce4df81 (`Refactor
 the Mighty Simplifier`).

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15325#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler