Subject: bug#17498: 24.4.50; This function has a compiler macro `yes--cmacro'.

From: Leo Liu <[email-masked]>
Date: Sat, 17 May 2014 02:28:32 +0800

On 2014-05-16 10:59 +0200, Nicolas Richard wrote:
> This case could be "fixed" by optimizing `when' for a nil condition

NIL is used to show the compiler macro is always defined; it could be
any non-constant expression. But thanks for pointing me to
eval-and-compile.

Leo