nadvice compatibility in package list

[Andy Moreton]

Hi,

When running "M-x package-list" on master, the excorporate package is
shown as incompatable:

  Package excorporate is incompatible.

       Status: Incompatible because it depends on uninstallable packages.
      Archive: gnu
      Version: 0.8.3
      Summary: Exchange Web Services (EWS) integration
     Requires: emacs-24.1, fsm-0.2.1, soap-client-3.1.5, url-http-ntlm-2.0.4, 
nadvice-0.3 (not available)
     Homepage: https://www.fitzsim.org/blog/
     Keywords: calendar 

The nadvice compatibility package is shown:

  Package nadvice is available.

       Status: Available from gnu -- Install
      Archive: gnu
      Version: 0.3
      Summary: Forward compatibility for Emacs-24.4's nadvice
     Homepage: https://elpa.gnu.org/packages/nadvice.html

This is ok for older emacsen, but there is no listing for the builtin
nadvice 1.0 package. Also:

  (assoc 'nadvice package--builtin-versions)
  => (nadvice 1 0)

  (assoc 'nadvice package--builtins)
  => nil

Is this expected ?

    AndyM