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TyAppPat_ExistentialEscape.hs:10:20: error:
• Couldn't match expected type ‘p’ with actual type ‘a’
‘a’ is a rigid type variable bound by
a pattern with constructor: Some :: forall a. a -> Some,
in an equation for ‘foo’
at TyAppPat_ExistentialEscape.hs:10:6-14
‘p’ is a rigid type variable bound by
the inferred type of foo :: Some -> p
at TyAppPat_ExistentialEscape.hs:10:1-26
• In the expression: x :: a
In an equation for ‘foo’: foo (Some @a x) = (x :: a)
• Relevant bindings include
x :: a (bound at TyAppPat_ExistentialEscape.hs:10:14)
foo :: Some -> p (bound at TyAppPat_ExistentialEscape.hs:10:1)
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