bug#37400: Patch for bug in cl-reduce: function called with no arguments when list is empty

[Lars Ingebrigtsen]

Noam Postavsky <npostavs@gmail.com> writes:

> Actually, I think it's a docstring bug.  The Common Lisp Hyperspec says:
>
>     If the subsequence is empty and no initial-value is given, then the
>     function is called with zero arguments, and reduce returns whatever
>     function does. This is the only case where the function is called
>     with other than two arguments.

I've now added a variation of this to the doc string, and I'm closing
this bug report.

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