If multibin feature is enabled, this returns a tokenstream for the attribute #[cfg_attr(not(core = "x"), your_attr)]
Otherwise None is returned
If multibin feature is enabled, this returns a tokenstream for the attribute #[cfg(core = "x")] to partition an application
to multiple binaries. Otherwise None is returned
If multibin feature is enabled, this returns a tokenstream for the attribute #[cfg(not(core = "x"))]
Otherwise None is returned
If multibin feature is enabled, this returns a tokenstream for the attribute #[multibin_shared] to make sure the annotated variable
is present at the same address on all cores. Otherwise None is returned