Trying again.

This is Debian 27.1 with the following libraries taken from trunk as of
11 February (unchanged as of today):

 rmail
 rmailedit
 rmailmm
 rmailout
 rmailsum

And the attached files used for testing:

 /tmp/RMAILbug
 /tmp/bug.el

emacs -Q -nw
M-x load-library RET /tmp/bug.el RET
C-u M-x rmail RET /tmp/RMAILbug RET	<-- looking at message #3
C-d 	      	  			<-- looking at message #2
o /tmp/a RET				<-- looking at message #3

After the last command I should get a message saying that no more
undeleted messages are there, and be looking at message #2, however I
get no message and I am looking a message #3.