ALGOL Y
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ALGOL Y was the name given to a speculated successor for the ALGOL 60 programming language that incorporated some radical features that were rejected for ALGOL 68 and ALGOL X. ALGOL Y was intended to be a "radical reconstruction" of ALGOL.
One such feature was the possibility to construct new proc mode
's at run-time, which was criticized as the ability to modify its own programs at run time while, on the other hand, it would have brought ALGOL Y to the same level of expressiveness as LISP.