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(x1 == x2) && (str1 == str2)</lang>
And now I can, for example, use the function "func" on two arguments of type Foo.
=={{header|Icon and Unicon}}==
==={{header|Icon}}===
Icon is not object-oriented.
==={{header|Unicon}}===
Unicon does not distinguish between abstract and concrete classes.
However, programmers may detect unimplemented methods using the same approach
as with other, similar languages.
<lang unicon>class abstraction()
method compare(l,r)
runerr(1038, "method compare in class abstraction")
end
end</lang>
=={{header|J}}==
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