*** The new macro with-output-to-string executes some Lisp expressions<BR>
with standard-output set up so that all output feeds into a string.
Then it returns that string.
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For example, if the current buffer name is `foo',
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(with-output-to-string
  (princ "The buffer is ")
  (princ (buffer-name)))
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returns "The buffer is foo".
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