Routine mapping?

[einar]

Right now, ZX BASIC already supports variable mapping. If I already have a variable defined at a certain memory address, I can reference it as follows:

Code:

DIM x AS UBYTE AT 64000

It would be nice if ZX BASIC could also support routine mapping. If I already have an assembly routine implemented at a certain memory address, I would like to reference it as follows:

Code:

DECLARE sub FASTCALL doSomething(src as UINTEGER, dst as UINTEGER) AT 64000

In the meantime, I'm having to use this workaround:

Code:

sub FASTCALL doSomething(src as UINTEGER, dst as UINTEGER)
    asm
        jp 64000
    end asm
end sub

EDIT: Of course routine mapping should also work with both sub-routines and functions, either FASTCALL or not, exactly like any other ZX BASIC routine implemented in asm directly inside the routine body.