Re: require printing causes an error

[Stefan]

> Well, the byte-compiler said as warning, but the code byte-compiled didn't
> run properly.  So, I thought it was a byte-compiler problem.

Most likely it's because the warning was indeed about a real problem.
You'd have to give more precise info to get a more useful answer.

>> (defalias 'foo-A
>> (cond
>> (some-condition-A
>> (lambda () code-for-A ))
>> (t
>> (lambda () code-for-B))))
>> 
>> This makes it obvious to the byte-compiler that `foo-A' will be defined.
>> Admittedly, the byte-compiler only started to recognize the above form
>    a few
>> days ago.

> Good! :)

> Is this new form recognized by Emacs 20 byte-compiler?

By "recognize" I meant that it prevents the spurious warnings.  As far as
the generated code goes, it's been "recognized" for as long as I can remember.
I.e. it'll work in Emacs-19 as well, but you'll get spurious warnings unless
you byte-compile with Emacs-CVS.

> The other form used in printing package is:

>    (cond
>      (some-condition-A
>        (defun foo-A () code-for-A ))
>      (some-condition-B
>        (defvar var-B some-default-B)
>        (defun foo-A () code-for-B)))

Oh yes, IIRC the (defvar var-B some-default-B) is just to turn off warnings
as well, in which case it should really be moved to the toplevel and turned
into

  (defvar var-B) ;; Without any default value.  It's only a byte-compiler hint.


-- Stefan