VALIDITY VTBT

ETL2 p.210 and ETR p.47:
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A Bit_type declaration is valid if and only of its Constant is of
type INTEGER, and has a positive value.
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TEST DESCRIPTION:
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Class BB inherits from CC [BIT -0]. '-0' is equal to '0', which is
a positive value, so validity VTBT is not violated.
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TEST RESULTS:
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ISE Eiffel 5.0.016:    OK
SmallEiffel -0.76:     PASSED    '-0' is not considered as a positive
                                 value, and hence VTBT is violated.
Halstenbach 3.2:       OK
gelint:                OK
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TEST CLASSES:
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class AA

creation

	make

feature

	make is
		local
			b: BB
		do
			!! b
			print (b.item.count)
		end

end -- class AA
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class BB

inherit

	CC [BIT -0]

end -- class BB
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class CC [G]

feature

	item: G

end -- class CC
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