The egison package
An interpreter for Egison, the world's first programming langugage which realized non-linear pattern-matching with unfree data types. With Egison, you can represent pattern-matching with unfree data types intuitively, especially for collection data, such as lists, multisets, sets. You can find Egison programs in "lib" and "sample" directories. This package also include Emacs Lisp file "egison-mode.el" in "elisp/" directory.
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