{
  "$type": "site.standard.document",
  "bskyPostRef": {
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    "uri": "at://did:plc:pi6woz4d47bkuws673w2il2r/app.bsky.feed.post/3mot4kf6kswr2"
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  "path": "/t/error-ghc-91510-illegal-polymorphic-type/14304#post_5",
  "publishedAt": "2026-06-21T17:37:02.000Z",
  "site": "https://discourse.haskell.org",
  "textContent": "Horrible hack, but:\n\n\n    type Objects :: Type -> (k -> k -> Type) -> k -> Constraint\n    class C arr a => Objects c arr a where\n      type C arr a :: Constraint\n\n    data DoOrd\n\n    instance Ord a => Objects DoOrd (->) a where\n      type C _ a = Ord a\n",
  "title": "Error GHC-91510: illegal polymorphic type"
}