[Bug fortran/96255] [F2018] Implement optional type spec for index in DO CONCURRENT

[jvdelisle at charter dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96255

--- Comment #5 from jvdelisle at charter dot net ---
(In reply to kargl from comment #2)
> This issue depends on the fix for FORALL.  In gfc_match_do in the concurrent
> section, one gets to 
> 
>       m = match_forall_header (&head, &mask);
> 
> to match the control portion of the statement.

Although we need to support forall, it is interesting that the standards
committe i going to deprecate it, if they have not done so already. Not
encouraged to be used for sure. Also they will be adding features to DO
CONCUURENT which look useful to me.