[Bug fortran/64958] Warn if INTENT(IN) is changed by passing to no-intent argument

[tkoenig at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64958

--- Comment #1 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
If this mechanism is in place, it could also be used to catch code like

call foo(a+1)

...


subroutine foo(a)
   a = a + 1
end subroutine