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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)