Shen 4.1 (required: to put the Lisp compiler in silent mode)

Somebody posted to me this message

QUOTE
Further to this y/n question when working through the "Shen in 15
minutes" the y/n question shows with both Clisp and SBCL on WinXP but
neither will take y or n (or N or no or No) as a response. The only
way I've found to get out of it is to abort with ^ viz

(29-) (define f
0 -> 1
1 -> 0)
f

(30-) (f 2)
partial function f;
track f?  (y/n) y
please answer y or n
track f?  (y/n) y
please answer y or n
track f?  (y/n) ^
line read aborted

(31-)

Does track (y/n) work on any platform? (I've not tried linux or OS X)
UNQUOTE

There was a bug and I've fixed this bug in 4.1.

However one annoyance is that I cannot suppress warning messages from