Source files should have one module or a main program

[Beliavsky]

For a code such as

module foo
implicit none
end module foo

module bar
implicit none
end module bar

implicit none
print*,"hi"
end

I suggest that Fortitude warn that there are multiple modules defined in a single source file and that the source file has both a module and a main program. It could also warn that the modules are empty and not used in the program.