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Joined 1 year ago
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Cake day: October 17th, 2023

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  • nil being self-evaluating is not strange. Since nil is a symbol it can be defined as a constant. So there is nothing to stop a Lisp implementation saying (in CL):

    (defconstant nil 'nil)
    

    just the same as

    (defconstant t 't)
    

    What is strange is these things:

    strange thing true in CL? true in elisp? true in Scheme?
    () is a list but not a cons yes yes yes
    () is both a list and a symbol yes yes no
    () is self-evaluating yes yes no