[J3] Vector subscripts and INTENT(INOUT)

[Bill Long]

I’m still sympathetic to Rafik’s comment.  When a statement about vector-subscripted array sections has been in the standard since array sections were introduced, and then disappears in a draft of the next standard, it is at least concerning, and naturally interpreted as a technical change. 

In fact, there is a minor technical change in this case, in that the old sentence did not account for the case of the dummy argument having the VALUE attribute. 

That said, I think it would be helpful to include a sentence in 9.5.3.2.2 something like

 “Additional limitations related to the use of an array section with a vector subscript as an actual argument are in 15.5.2.4."

That is purely editorial (in bounds for the next J3 meeting) and would help avoiding future confusion. 

Cheers,
Bill


> On May 15, 2018, at 11:46 AM, Rafik Zurob <rzurob at ca.ibm.com> wrote:
> 
> > 
> > I did go back and look at old standards.  F2008, in the “Vector 
> > subscript” subclause of 6, has “An array section with a vector 
> > subscript shall not be argument associated with a dummy array that 
> > is defined or redefined.”.    That is the “shall not” rule that 
> > supports the factual claim in the argument association clause that 
> > the dummy is undefinable.   The same rule is in all the standards 
> > going back to F90.   For some reason it was dropped in the F2018 
> > draft, which is the one I was originally reading.  If it was added 
> > back into F2018, then there would be a rule-based justification for 
> > the claim that the dummy argument is not definable. I would find 
> > that a substantial improvement. 
> > 
> > 
> 
…

> 
> I fully support putting the rule back in F2018 draft. (Or if there is good reason for dropping it, I would appreciate learning it.)
> 
> Regards
> 
> Rafik

Bill Long                                                                       longb at cray.com
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