tcfail067.hs:60:
    Could not deduce `Show (SubRange a1)' from the context (Num a)
    Probable fix:
	Add `Show (SubRange a1)' to the instance declaration context
	Or add an instance declaration for `Show (SubRange a1)'
    arising from an instance declaration at tcfail067.hs:60

tcfail067.hs:61:
    Could not deduce `Ord a1'
	from the context (Num (SubRange a),
			  Num a,
			  Eq (SubRange a),
			  Show (SubRange a))
    Probable fix:
	Add `Ord a1' to the instance declaration context
    arising from use of `numSubRangeNegate' at tcfail067.hs:61
    in the definition of function `negate': numSubRangeNegate

tcfail067.hs:74:
    Could not deduce `Ord a' from the context (Num a)
    Probable fix:
	Add `Ord a' to the type signature(s) for {numSubRangeBinOp}
    arising from use of `SubRange' at tcfail067.hs:74
    in the definition of function `numSubRangeBinOp':
	SubRange (result, result) result