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T16512a.hs:41:25: error: [GHC-25897]
• Couldn't match type ‘b’ with ‘a -> b’
Expected: AST (ListVariadic (a : as) b)
Actual: AST (ListVariadic as (a -> b))
‘b’ is a rigid type variable bound by
the type signature for:
unapply :: forall b. AST b -> AnApplication b
at T16512a.hs:37:1-35
• In the first argument of ‘AnApplication’, namely ‘g’
In the expression: AnApplication g (a `ConsAST` as)
In a case alternative:
AnApplication g as -> AnApplication g (a `ConsAST` as)
• Relevant bindings include
g :: AST (ListVariadic as (a -> b)) (bound at T16512a.hs:40:23)
a :: AST a (bound at T16512a.hs:38:15)
f :: AST (a -> b) (bound at T16512a.hs:38:10)
unapply :: AST b -> AnApplication b (bound at T16512a.hs:38:1)
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