[J3] [EXTERNAL] [BULK] Re: Description of MOLD in an allocate statement.

Tue Dec 16 16:18:16 UTC 2025

Yes - thank you Bob and Steve.

Cheers,

  *
Tom

[cid:image001.png at 01DB793A.BCC25CC0]<https://www.nasa.gov/>

Thomas Clune

Lead, Software Infrastructure

Global Modeling and Assimilation Office

NASA Goddard Space Flight Center

MS 610.1

8800 Greenbelt RD, Greenbelt, MD 20771

Thomas.L.Clune at nasa.gov<mailto:Thomas.L.Clune at nasa.gov>

From: J3 <j3-bounces at mailman.j3-fortran.org> on behalf of Steve Lionel via J3 <j3 at mailman.j3-fortran.org>
Date: Tuesday, December 16, 2025 at 11:06 AM
To: j3 at mailman.j3-fortran.org <j3 at mailman.j3-fortran.org>
Cc: Steve Lionel <steve at stevelionel.com>
Subject: [EXTERNAL] [BULK] Re: [J3] Description of MOLD in an allocate statement.

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Tom,

I understand your confusion; it took me a bit too. The key is that the BNF for both SOURCE= and MOLD= is source-expr. You can then find what happens when source-expr appears in p5.  Further, C949 prohibits both SOURCE= and MOLD= from appearing.

Steve

On 12/16/2025 9:47 AM, Clune, Thomas L. (GSFC-6101) via J3 wrote:
Perhaps my PDF search is failing me, but as far as I can tell the only description of the functionality of MOLD=  in the standard is the following on p160 of 25-007r1:

If MOLD= appears and source-expr is a variable, its value need not be defined.

Hopefully I’m just not finding it.  Otherwise, surely we can provide just a bit of normative text describing the intent here?

  *
Tom

[cid:part1.d00yeORi.kSgKshI7 at stevelionel.com]<https://www.nasa.gov/>

Thomas Clune

Lead, Software Infrastructure

Global Modeling and Assimilation Office

NASA Goddard Space Flight Center

MS 610.1

8800 Greenbelt RD, Greenbelt, MD 20771

Thomas.L.Clune at nasa.gov<mailto:Thomas.L.Clune at nasa.gov>

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