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

[jvdelisle at gcc dot gnu.org via Gcc-bugs]

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

--- Comment #16 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
(In reply to Jerry DeLisle from comment #15)

> 
> Notice that outside the loop the index variables are not defined but we do
> not give an diagnostic about not being implicitly declared.
> 
> Seeking clarification/opinion.

Both NAG and Flang-new give an error.