e6556db420
Looking at uses of `derived-mode-p` and `provide-mode-derived-p`, I can't find a single use case where it wouldn't be preferable for it to take a single argument instead of `&rest`: all the calls are either passing a single argument anyway, or passing a fixed list of modes. The use of `&rest` just makes the code less efficient and sometimes more clunky (because of the need for `apply`). So let's change that (while preserving backward compatibility, of course). * doc/lispref/modes.texi (Derived Modes): Adjust accordingly. * lisp/subr.el (provided-mode-derived-p, derived-mode-p): Take the `modes` as a single argument.
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