[GHC] #14627: qAddTopDecls: can't convert top-level declarations

[GHC]

#14627: qAddTopDecls: can't convert top-level declarations
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        Reporter:  tianxiaogu        |                Owner:  mgsloan
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Template Haskell  |              Version:  8.2.2
      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:                    |
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Comment (by mgsloan):

 I've put up a patch that makes addTopDelcs no longer panic for conversion
 errors: https://phabricator.haskell.org/D4914 .  Instead they are reported
 as normal errors like this:


 {{{
 T14627.hs:3:3: error:
     qAddTopDecls: can't convert declarations:
       Illegal variable name: ‘Bool’
       When splicing a TH declaration: f_0 = Bool
   |
 3 | $(do
   |   ^^...
 }}}

 Atop this, the error "Illegal variable name: 'Bool'" is quite poor,
 instead it should just say there's an out of scope constructor.  I have a
 patch that fixes this and adds documentation to `UnboundVarE` clarifying
 this case.  Can't push it to phabricator yet, though, because it appears
 to be down.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14627#comment:3>
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