For that, I want to properly handle forward reference warnings from
files that are *not* being (re)compiled in the current session but
have been in a previous one. And so on supported implementations
(currently CCL, SBCL), I am saving the deferred warnings about such
forward references. Could you help me do that with ECL?
"actions deferred by the compiler until the end of compilation will be deferred until the end of the outermost call to with-compilation-unit."