Lithe is a programming language created in 1982.
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Lithe is an experimental programming language created in 1982 by David Sandberg at the University of Washington which allows the programmer to freely choose their own syntax. Lithe combines the ideas of syntax-directed translation and classes in a novel manner that results in a remarkably simple yet powerful language.. Read more on Wikipedia...
rule "|" <i:int> "|" return int;
{if i<0 then return -i else return i end}