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RE: [External] : M-. vs C-h o

From: Drew Adams
Subject: RE: [External] : M-. vs C-h o
Date: Fri, 22 Oct 2021 01:06:54 +0000

> mapc is a built-in function in ‘src/fns.c’.

That tells you that it's a Lisp function that's
"built-in", meaning that it's implemented in C.
And it points you to the C definition in fns.c.

That C code provides the complete definition,
including the doc string.

> DEFUN ("mapc", Fmapc, Smapc, 2, 2, 0,

That tells you that Lisp function `mapc' is
defined using C definition Fmapc, and the
function takes two arguments.  Someone else
can provide or point you to more info about

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