BIN_IS_TOPLEVEL  2365 gst/gstbin.c         toplevel = BIN_IS_TOPLEVEL (bin);
BIN_IS_TOPLEVEL  2742 gst/gstbin.c     toplevel = BIN_IS_TOPLEVEL (bin);
BIN_IS_TOPLEVEL  2870 gst/gstbin.c     toplevel = BIN_IS_TOPLEVEL (bin);