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(elisp)Comments

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Comments
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   A "comment" is text that is written in a program only for the sake
of humans that read the program, and that has no effect on the meaning
of the program.  In Lisp, a semicolon (`;') starts a comment if it is
not within a string or character constant.  The comment continues to
the end of line.  The Lisp reader discards comments; they do not become
part of the Lisp objects which represent the program within the Lisp
system.

   The `#@COUNT' construct, which skips the next COUNT characters, is
useful for program-generated comments containing binary data.  The
Emacs Lisp byte compiler uses this in its output files (Note: Byte
Compilation).  It isn't meant for source files, however.

   Note: Comment Tips, for conventions for formatting comments.