> Hi all --
>
> Consider the following module:
>
> ---CUT---
> module foo
>
> implicit none
>
> contains
>
> subroutine main_sub ()
>
> call internal_sub()
>
> contains
>
> subroutine internal_sub()
>
> call QAG(other_sub)
>
> end subroutine internal_sub
>
> end subroutine main_sub
>
> subroutine other_sub ()
>
> end subroutine other_sub
>
> end module foo
> ---CUT---
>
> (FYI, this is a cut-down version of a more extended code; the external
> subroutine QAG, for which an explicit interface is *not* defined, is part of
> QUADPACK).
>
> This compiles fine with Intel Fortran (Linux), but on gfortran 4.3.1, I get the
> following error:
>
> foo.f90:15.24:
>
> call QAG(other_sub)
> 1
> Error: Symbol 'other_sub' at (1) has no IMPLICIT type
>
> I don't really understand what this error message means; surely, the other_sub
> name uniquely identifies a subroutine throughout the whole module? Is my code
> standard conforming or not?