[GHC] #13614: Rewrite rules not applied exhaustively when simplifying from plugin

[GHC]

#13614: Rewrite rules not applied exhaustively when simplifying from plugin
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        Reporter:  nomeata           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  GHC API           |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nomeata):

 >  I wonder if you have ensured that GHC.Base is loaded? If the interface
 is not loaded, GHC won't see the rule.

 Yes, `GHC.Base` is loaded.

 I was under the impression that (non-orphan) rules are attached to the
 `ID`, so should it matter? Or is that only true for locally defined rules?
 Or is `GHC.Base` special in that matter?

 In the above plugin code, the result of `getRuleBase` is indeed empty, and
 so is `mg_rules guts`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13614#comment:7>
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