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BFM
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BFM, devised by Frédéric van der Plancke, is Brainfuck with macros, an extension to the popular Turing tarpit.
It has higher-order macros, that is macros can be given as argument to other macros. The macro system is thus a lambda-calculus superimposed on the basic Brainfuck layer and is a Turing-complete language in its own right.