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Metafractran is a derivative of Fractran created by User:Challenger5 in which all program files are irrelevant. Rather than being specified by a program file, code is instead determined from that file's metadata; specifically, its location in the filesystem.

  • The list of fractions is given by the longest suffix of the list of components of the filepath of the form <positive integer>:<positive integer>.
  • The name of the file must consist of a single positive integer, representing the starting number, followed by an optional file extension.

The file passed to the interpreter must exist, but no restrictions are otherwise made on its contents.

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