tcfail067.hs:1: tcfail067.hs:76: Context required by inferred type, but missing on a type signature:
		    at a use of an overloaded identifier: `SubRange'
		    `PrelBase.Ord' `a{-a1dZ-}'
    When checking signature(s) for: `numSubRangeBinOp'
 
tcfail067.hs:65: tcfail067.hs:61: Context required by inferred type, but missing on a type signature:
		     at a use of an overloaded identifier: `numSubRangeNegate'
		     `PrelBase.Ord' `a{-a1fx-}'
    When checking methods of an instance declaration


Compilation had errors