[GHC] #10743: Data declaration order matters to compiler.

[GHC]

#10743: Data declaration order matters to compiler.
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        Reporter:  thomaseding       |                   Owner:
            Type:  bug               |                  Status:  closed
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.8.3
      Resolution:  invalid           |                Keywords:
Operating System:  Windows           |            Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Changes (by bgamari):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 This is (arguably unfortunately) the expected behavior. See the discussion
 of "declaration groups" in
 [https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/template-
 haskell.html Section 7.17.1] of the User's Guide.

 In short, splices delimit groups of declarations. Declarations can only be
 recursive within their group. The usual solution here would be to move the
 `makeLenses` splice after the `data NonPlayer` definition.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10743#comment:1>
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