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How can I tell Emacs that the function foo is a function and defined in the dynamic module foo.c, not the elisp file which loaded it, baz.el? Emacs 27 now knows this. Well, technically it knows that foo is a function defined in foo.so, but you can then translate this to foo.c pretty easily, e.g.: (replace-regexp-in-string (rx (eval module-file-suffix) eos) ...


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The use of (fn ARGS) syntax is described in (elisp) Function Documentation: The last line of the documentation string can specify calling conventions different from the actual function arguments. Write text like this: \(fn ARGLIST) following a blank line, at the beginning of the line, with no newline following it inside the documentation string. ...


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