bug#29165: 26.0.90; can't use some code byte-compiled under emacs 24

[Drew Adams]

> > CL accepts a single variable after &rest. And there must be
> > a variable after &optional.  (&optional foo &rest bar) is OK.
> >
> > (&optional &rest foo) is not OK.
> > (&optional foo &rest bar toto titi) is not OK.
> 
> Is this CL in general or a particular CL implementation? The web page you
> sent the URL for earlier reads like a specification, and from its use of
> “*” looks to me like it allows the (admittedly useless) form of &optional
> with no variables.

What I wrote was from memory.  What counts is the definition
of CL.  If it doesn't forbid such constructions then an
implementation or emulation) of CL is free to support them.

If it doesn't define them then an implementation is free
to define them any way it wants.