It looks to me as if --verbose "leaks" or accesses buffers from other parts of the session. The error looks like it's part of the authentication procedure. Confirmed on Cygwin with Yafc 1.3.4 and on Ubuntu with 1.3.1.
1/1: admin@ubuntu1404[tmp] yafc> ls -Al
total 15854
-rw-r--r-- 0 admin admin 15854 Sep 6 09:46 .zshrc
1/1: admin@ubuntu1404[tmp] yafc> rm --verbose .zshrc
~/tmp/.zshrc: Access denied. Authentication that can continue: publickey
1/1: admin@ubuntu1404[tmp] yafc> ls -Al
total 0
1/1: admin@ubuntu1404[tmp] yafc> put .zshrc
.zshrc: 15,5KiB of 15,5KiB transferred (100,0%)
time elapsed: 0:00m transfer rate: 15,5KiB/s
1/1: admin@ubuntu1404[tmp] yafc> rm .zshrc
1/1: admin@ubuntu1404[tmp] yafc>
It looks to me as if
--verbose
"leaks" or accesses buffers from other parts of the session. The error looks like it's part of the authentication procedure. Confirmed on Cygwin with Yafc 1.3.4 and on Ubuntu with 1.3.1.