[GHC] #10796: Illegal data constructor name: `fromList' ... When splicing a TH expression

[GHC]

#10796: Illegal data constructor name: `fromList' ... When splicing a TH expression
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        Reporter:  erisco            |                Owner:  RyanGlScott
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Template Haskell  |              Version:  7.8.3
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1313
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Comment (by Austin Seipp <austin@…>):

 In [changeset:"d2f9972a35ce05ceb8a78893e433ef1df06f73ef/ghc" d2f9972/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="d2f9972a35ce05ceb8a78893e433ef1df06f73ef"
 Make dataToQa aware of Data instances which use functions to implement
 toConstr

 Trac #10796 exposes a way to make `template-haskell`'s `dataToQa` function
 freak out if using a `Data` instance that produces a `Constr` (by means of
 `toConstr`) using a function name instead of a data constructor name.
 While
 such `Data` instances are somewhat questionable, they are nevertheless
 present
 in popular libraries (e.g., `containers`), so we can at least make
 `dataToQa`
 aware of their existence.

 In order to properly distinguish strings which represent variables (as
 opposed
 to data constructors), it was necessary to move functionality from
 `Lexeme` (in
 `ghc`) to `GHC.Lexeme` in a new `ghc-boot` library (which was previously
 named
 `bin-package-db`).

 Reviewed By: goldfire, thomie

 Differential Revision: https://phabricator.haskell.org/D1313

 GHC Trac Issues: #10796
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10796#comment:11>
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