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Format and index concept 'predicate' in ELisp Intro

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* doc/lispintro/emacs-lisp-intro.texi (Wrong Type of Argument):
Add index and format definition (bug#52197).

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YugaEgo 2021-11-30 14:03:32 +01:00 • committed by Lars Ingebrigtsen
parent ab291656d0
commit cd9dd26d24
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doc/lispintro/emacs-lisp-intro.texi
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@ -2146,9 +2146,10 @@ number---the number of characters the location is from the beginning
of the buffer.) In Emacs Lisp, @code{+} can be used to add the
numeric value of marker positions as numbers.
@cindex @samp{predicate} defined
The @samp{p} of @code{number-or-marker-p} is the embodiment of a
practice started in the early days of Lisp programming. The @samp{p}
stands for ``predicate''. In the jargon used by the early Lisp
stands for @dfn{predicate}. In the jargon used by the early Lisp
researchers, a predicate refers to a function to determine whether some
property is true or false. So the @samp{p} tells us that
@code{number-or-marker-p} is the name of a function that determines