Defstruct and #s bug?

[This is merely a FYI bug report, I'm unsure if this is the appropriate
place to send it.]

I confess to not having looked at the spec in detail, but I suspect this
is non-conformant:

> (defstruct (foo (:constructor foo-boa (c b a))) a b c)
> (read-from-string (prin1-to-string (foo-boa 1 2 3)))

Yields error "Can't initialize structure from (FOO :A 3 :B 2 :C 1)." I
would expect the #s reader macro to be able to read a struct even when
the default constructor isn't there.

> (values (lisp-implementation-type) (lisp-implementation-version))
"Clozure Common Lisp"
"Version 1.3-r11936  (WindowsX8632)"

Regards,
Frode V. Fjeld