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tcfail133.hs:2:61:
Warning: -XDatatypeContexts is deprecated: It was widely considered a misfeature, and has been removed from the Haskell language.
tcfail133.hs:68:14:
No instance for (AddDigit (Zero :@ (One :@ One)) One a0)
arising from a use of `add'
Possible fix:
add an instance declaration for
(AddDigit (Zero :@ (One :@ One)) One a0)
In the second argument of `($)', namely
`add (One :@ Zero) (One :@ One)'
In the expression: show $ add (One :@ Zero) (One :@ One)
In an equation for `foo':
foo = show $ add (One :@ Zero) (One :@ One)
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