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T15795.hs:12:3: error: [GHC-71451]
• Cannot generalise type; skolem ‘k’ would escape its scope
if I tried to quantify (a0 :: k) in this type:
forall k (b :: k). T @k @a0 b
(Indeed, I sometimes struggle even printing this correctly,
due to its ill-scoped nature.)
• In the definition of data constructor ‘MkT’
In the data declaration for ‘T’
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