[BUG] With RC_EXPAND_PARAM, s:string: does not elide an empty field

[Vincent Lefevre <vincent@xxxxxxxxxx>]

The zshexpn(1) man page says:

  s:string:
[...]
    For historical reasons, the usual behaviour that  empty  array
    elements  are  retained  inside  double quotes is disabled for
    arrays generated by splitting; hence the following:

            line="one::three"
            print -l "${(s.:.)line}"

    produces two lines of output for one and three and elides  the
    empty  field.   To  override  this behaviour, supply the `(@)'
    flag as well, i.e.  "${(@s.:.)line}".

But without the (@) flag, if the RC_EXPAND_PARAM option is set,
this does not elide the empty field:

cventin% line="one::three" ; print -l "${(s.:.)line}"
one
three
cventin% setopt RC_EXPAND_PARAM
cventin% line="one::three" ; print -l "${(s.:.)line}"
one

three
cventin% echo $ZSH_VERSION
5.9

-- 
Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / Pascaline project (LIP, ENS-Lyon)