CLU is an actively used programming language created in 1975.

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Example code from Wikipedia:

complex_number = cluster is add, subtract, multiply, ...
        rep = record [ real_part: real, imag_part: real ]
        add = proc ... end add;
        subtract = proc ... end subtract;
        multiply = proc ... end multiply;
        ...
    end complex_number;
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Last updated February 11th, 2019