[J3] New intrinsic XXX_PREFIX and XXX_SUFFIX procedures

[Van Snyder]

On Thu, 2023-01-26 at 16:52 +0000, Brad Richardson via J3 wrote:
> I've been pondering this more, and I think the way I'd like to
> propose
> this is as a single new intrinsic. I think it could in theory be
> named
> SCAN, as the interface would be fully distinguishable from the
> existing
> SCAN intrinsic for character set membership search. The interface
> would
> be:
> 
> SCAN(ARRAY, OPERATION[, IDENTITY, DIM, MASK, SEGMENT, EXCLUSIVE,
> REVERSED, ORDERED])

There should be two varieties of OPERATION. One would be an enumerator
of an enumeration type defined in ISO_Fortran_Env. The other would be a
two-argument function provided by the user.

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