[Bug fortran/80467] Function Without Arguments Fails to Generate Error When Declared Later

[jeffrey.armstrong at approximatrix dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80467

--- Comment #5 from Jeffrey Armstrong <jeffrey.armstrong at approximatrix dot com> ---
It's actually easy to trigger the ICE with a small change.  The following
causes an internal compiler error wiht GCC 6.3 under MinGW-W64:

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
program noargs
implicit none

    Print *, "Testing..."
    Call TestArgs
    Print *, "Done."

contains

    Subroutine TestArgs
    implicit none

        Real::compareTo
        Integer::i

        compareTo = GetValue
        do i=1,10
            if(Real(i) > GetValue) Then
                Print *, "bigger"
            end if
        end do

    End Subroutine TestArgs

    Function GetValue()
    implicit none

        Real::GetValue
        GetValue = 3.0
    End Function GetValue

end program noargs
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

In this case, the user is repeatedly and incorrectly calling GetValue without
arguments.  The compiler output is:

test.f90:10:0:

     Subroutine TestArgs

internal compiler error: in convert_move, at expr.c:268
libbacktrace could not find executable to open
Please submit a full bug report,
with preprocessed source if appropriate.
See <...> for instructions.
Error(E42): Last command making (build\test.o) returned a bad status
Error(E02): Make execution terminated