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GNU Emacs Lisp Reference Manual

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1.3.6 Buffer Text Notation

Some examples describe modifications to the contents of a buffer, by showing the "before" and "after" versions of the text. These examples show the contents of the buffer in question between two lines of dashes containing the buffer name. In addition, `-!-' indicates the location of point. (The symbol for point, of course, is not part of the text in the buffer; it indicates the place between two characters where point is currently located.)

---------- Buffer: foo ----------
This is the -!-contents of foo.
---------- Buffer: foo ----------

(insert "changed ")
     => nil
---------- Buffer: foo ----------
This is the changed -!-contents of foo.
---------- Buffer: foo ----------

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