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type MyType = ref object of RootObj
    p_attrib: int


method attrib*(obj: MyType): int =
    result = obj.p_attrib

method `attrib=`*(obj: var MyType, value: int) =
    obj.p_attrib = value


var x: MyType

x.new
echo x.attrib
x.attrib = 5
echo x.attrib


type SubType = ref object of MyType

var y: SubType
y.new
echo y.attrib
y.attrib = 9
echo y.attrib