In the process of producing the patch for the isearch crash recently
discussed, I produced a test of the form

(with-temp-buffer
  (execute-kbd-macro vector-of-keystrokes))

I saved it to a file, and ran xemacs -vanilla, then M-x load-file RET
search-crash.el RET, and XEmacs didn't crash.  The reason was that
instead of being executed in the temp buffer, it was executed in
*scratch*, which contained the usual leading comment, so the buffer
underrun didn't happen.

Is this expected behavior?

I'll try to remember to produce a real test case tomorrow, but I need
some sleep now....

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