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About: M-expression     Goto   Sponge   NotDistinct   Permalink

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In computer programming, M-expressions (or meta-expressions) were an early proposed syntax for the Lisp programming language, inspired by contemporary languages such as Fortran and ALGOL. The notation was never implemented into the language and, as such, it was never finalized. Compared to S-expressions, M-expressions introduce function notation, infix operators (including a defun operator), and shorthands for cond and list into the language.