bug#25280: 25.1; define-inline doesn't support &rest

[Leo Liu <sdl.web@gmail.com>]

On 2016-12-27 12:42 -0500, Stefan Monnier wrote:
> OTOH it's not as efficient as we'd like.  The better way to write it is:
>
>     (define-inline sm-foo (&rest xs)
>       (inline-letevals xs (inline-quote (vector . ,xs))))

I misunderstood no support for `,@' implied `. ,'. Good to know it is
not the case. My experiment seems to suggest that inline-letevals is
only needed for variables that are eval'd more than once. Is that
understanding correct?

I also get compiler warning: 

In rest:
t2.el:4:38:Warning: reference to free variable ‘vector’

where t2.el has the contents:

;;; -*- lexical-binding: t -*-

(define-inline rest (&rest xs)
  (inline-letevals xs (inline-quote (vector . ,xs))))

Thanks,
Leo