[GHC] #16317: HIE files don't include module import/export information

[GHC]

#16317: HIE files don't include module import/export information
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           Reporter:  mpickering     |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:
          Component:  Compiler       |           Version:  8.6.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 HIE files don't record information about import/exports.

 This blocks implementing LSIF files which need to know about
 imports/exports.

 Export information can be read from `tcg_exports`.

 Import information can be got from the `HscEnv` and looked up using
 `findImportedModule` I think.


 Would be good to target this for 8.8 if there is any time remaining.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16317>
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