option to check that arguments to PACK conform?

[Paul Thomas]

Tobias,
> You could consider instead of creating a version with asprintf as in
> trans-array.c to call a library function.
> That way we could improve the error message output (cf. PR28494):
>
> Currently:
> Fortran runtime error: Array reference out of bounds for array 'r',
> upper bound of dimension 1 exceeded (in file 'array2.f90', at line 4)
>
> With a library function the following is possible:
> Fortran runtime error: Array reference out of bounds. Subscript 1 of
> array 'r' (value 5) exceeds upper bound of 4 (in file 'array2.f90', at
> line 4)"
>
> When extracting the name of the array for the error message consider
> also derived types:
> The current trans-array.c prints for 'i' exceeding the bounds: 'V'
> rather than 'array' for
>    V(1)%array(i)
> The best output would be of cause something like 'v%array'. (PR29800)
>   
Noted, but will get the conformance tests done first :-)

Paul