[MacPorts] #36377: hs-json: cannot satisfy -package-id mtl-2.1.2-02e701f9b1590ee88a0b5b0bd5d93a29

[MacPorts]

#36377: hs-json: cannot satisfy -package-id
mtl-2.1.2-02e701f9b1590ee88a0b5b0bd5d93a29
----------------------------+--------------------------------
  Reporter:  seba.szwarc@…  |      Owner:  macports-tickets@…
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.1.2
Resolution:                 |   Keywords:
      Port:  hs-json        |
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Comment (by brokaw@…):

 I had the same error. I got it after updating my ports with `port
 selfupdate && port upgrade outdated`

 A little poking around with `ghc-pkg` produced a warning that the ghc
 cache was outdated, and I should run `ghc-pkg recache`. So I did, and that
 fixed my problem.

 It looks like the `recache` command should run after a macports upgrade
 touches a haskell lib, but I'm not sure where that should be defined.
 Maybe this ticket should get sent to the haskell group portfile component?

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Ticket URL: <https://trac.macports.org/ticket/36377#comment:2>
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