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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