frame_file (Debugger::Context)

    /*
     *   call-seq:
     *      context.frame_file(frame_position) -> string
     *
     *   Returns the name of the file.
     */
    static VALUE
    context_frame_file(int argc, VALUE *argv, VALUE self)
    {
        VALUE frame;
        debug_context_t *debug_context;

        debug_check_started();
        frame = optional_frame_position(argc, argv);
        Data_Get_Struct(self, debug_context_t, debug_context);

        return rb_str_new2(GET_FRAME->file);
    }