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T8262.hs:5:15: error: [GHC-18872]
• Couldn't match a lifted type with an unlifted type
When matching types
a :: *
GHC.Prim.Int# :: TYPE 'GHC.Types.IntRep
• In the first argument of ‘Just’, namely ‘(1#)’
In the expression: Just (1#)
In an equation for ‘foo’: foo x = Just (1#)
• Relevant bindings include
foo :: p -> Maybe a (bound at T8262.hs:5:1)
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