[Bug fortran/66643] Missing compilation error for formatted data transfer without format

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66643

--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Created attachment 37610 [details]
> A preliminary patch
>
> Attached patch gives a diagnostic. Interestingly I found three test cases
> in the test suite that use the invalid construct.

Works as expected without regression.