[J3] Should defined input subroutine be called for a NULL value in the List-directed input?

[Steve Lionel]

On 8/28/2025 4:07 PM, Daniel Chen via J3 wrote:
> If that is the intent, would calling the defined input routine be 
> considered definition of the input item even though the routine could 
> potentially do nothing?

Even with a non-null input, the routine might not define the item as the 
dummy argument is INTENT(INOUT).

But the more I think about this, the more I am uncertain as to what 
should happen. The UDIO procedure is supposed to "read" from the 
pseudo-unit, so it could plausibly be expected to know how to process a 
null item. I'm going to withdraw my response and wait for others to 
chime in.

Steve