To Mock a Mockingbird

Author: Raymond M. Smullyan
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by anonymous   2018-03-19

That combinator is usually called a warbler; the name comes from Raymond Smullyan's book To Mock a Mockingbird, which has a bunch of logic puzzles around combinator functions, presented in the form of birds that can imitate each other's songs. See this usage in Suave, and this page which lists a whole bunch of combinator functions (the "standard" ones and some less-well-known ones as well), and the names that Smullyan gave them in his book.