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T3592.hs:8:5: error: [GHC-91028]
• Couldn't match type ‘a0’ with ‘T a’
Expected: T a -> String
Actual: a0 -> String
Cannot instantiate unification variable ‘a0’
with a type involving polytypes: T a
• In the expression: show
In an equation for ‘f’: f = show
• Relevant bindings include
f :: T a -> String (bound at T3592.hs:8:1)
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