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T18127a.hs:5:5: error: [GHC-91028]
• Couldn't match expected type ‘(forall a. a) -> ()’
with actual type ‘a1’
Cannot instantiate unification variable ‘a1’
with a type involving polytypes: (forall a. a) -> ()
• In the expression: undefined
In an equation for ‘a’: a = undefined
T18127a.hs:8:5: error: [GHC-91028]
• Couldn't match expected type ‘(Show a => a) -> ()’
with actual type ‘a3’
Cannot instantiate unification variable ‘a3’
with a type involving polytypes: (Show a => a) -> ()
• In the expression: undefined
In an equation for ‘b’: b = undefined
• Relevant bindings include
b :: (Show a => a) -> () (bound at T18127a.hs:8:1)
T18127a.hs:12:5: error: [GHC-91028]
• Couldn't match expected type ‘C -> ()’ with actual type ‘a0’
Cannot instantiate unification variable ‘a0’
with a type involving polytypes: C -> ()
• In the expression: undefined
In an equation for ‘c’: c = undefined
T18127a.hs:16:5: error: [GHC-91028]
• Couldn't match expected type ‘D a -> ()’ with actual type ‘a2’
Cannot instantiate unification variable ‘a2’
with a type involving polytypes: D a -> ()
• In the expression: undefined
In an equation for ‘d’: d = undefined
• Relevant bindings include
d :: D a -> () (bound at T18127a.hs:16:1)
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