bug#1817: 23.0.60; C-x RET c RET RET signals an error

[Glenn Morris]

Juri Linkov wrote:

>      The alias `last-input-char' exists for compatibility
>      with Emacs version 18.
>
> So I perhaps the doc string of `last-input-char' should say
> that it is an alias for `last-input-event'?

Definitely, and an obsolete one too, it sounds like.
Can't it be made a "real" alias?

The comment is also misleading:

  /* Last input character read for any purpose.  */
  Lisp_Object last_input_char;


last-command-char looks similar.