[J3] Conditional expressions using intrinsic function

[Van Snyder]

On Sat, 2021-06-26 at 23:20 -0600, Ondřej Čertík via J3 wrote:
> Hi,
> We have uploaded another syntax paper for the conditional
> expressions:
> https://j3-fortran.org/doc/year/21/21-165.txt
> 
> and answered common past objections there. If possible, we would like
> it to be considered on Monday (does not have to be a formal vote, but
> as an alternative to the other proposed syntax papers).
> Ondrej

Whatever syntax is ultimately selected, the one-consequent else "actual
argument is absent" functionality needs to be preserved.

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