[GHC] #13989: use templateHaskell type checker panic

[GHC]

#13989: use templateHaskell type checker panic
-------------------------------------+-------------------------------------
        Reporter:  chinaxing         |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.0.2
  checker)                           |
      Resolution:  duplicate         |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13106            |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * status:  new => closed
 * resolution:   => duplicate
 * related:   => #13106


Comment:

 Indeed, it's a duplicate of #13106. Moreover, the panic has nothing to do
 with Template Haskell. Here's the error you get with GHC 8.2.1:

 {{{
 $ /opt/ghc/8.2.1/bin/ghci Bug.hs
 GHCi, version 8.2.0.20170704: http://www.haskell.org/ghc/  :? for help
 Loaded GHCi configuration from /home/rgscott/.ghci
 [1 of 1] Compiling Service.HAEventBroker ( Bug.hs, interpreted )

 Bug.hs:25:13: error:
     Variable not in scope:
       get
         :: Update
              Service.HAEventBroker.EventQueue
 Service.HAEventBroker.EventQueue
    |
 25 |   EvQ el <- get
    |             ^^^

 Bug.hs:26:3: error:
     Variable not in scope:
       put
         :: Service.HAEventBroker.EventQueue
            -> Update Service.HAEventBroker.EventQueue ()
    |
 26 |   put $ EvQ (e:el)
    |   ^^^

 Bug.hs:30:13: error:
     Variable not in scope:
       get
         :: Update
              Service.HAEventBroker.EventQueue
 Service.HAEventBroker.EventQueue
    |
 30 |   EvQ el <- get
    |             ^^^

 Bug.hs:34:3: error:
     Variable not in scope:
       put
         :: Service.HAEventBroker.EventQueue
            -> Update
                 Service.HAEventBroker.EventQueue
 [Service.HAEventBroker.HAEvent]
    |
 34 |   put $ EvQ r
    |   ^^^

 Bug.hs:36:14: error:
     • Not in scope: data constructor ‘EventQueue’
     • In the Template Haskell quotation 'EventQueue
    |
 36 | $(makeAcidic 'EventQueue ['putEvent, 'pollEvent])
    |              ^^^^^^^^^^^
 }}}

 So the issue is out-of-scope identifiers.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13989#comment:2>
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