#[cfg(all(feature = "async-st", feature = "alloc"))]
pub trait MaybeSend {}
#[cfg(all(feature = "async-st", feature = "alloc"))]
impl<T> MaybeSend for T {}
#[cfg(all(not(feature = "async-st"), feature = "alloc"))]
pub trait MaybeSend: Send {}
#[cfg(all(not(feature = "async-st"), feature = "alloc"))]
impl<T: Send> MaybeSend for T {}