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T12430.hs:7:3: error: [GHC-05175]
• Type family equation violates the family's injectivity annotation.
Type variable ‘x’ cannot be inferred from the right-hand side.
In the type family equation:
F x = C x -- Defined at T12430.hs:7:3
• In the equations for closed type family ‘F’
In the type family declaration for ‘F’
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