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#[cfg(not(all(feature = "rayon", feature = "std")))]
pub trait TraitCfg {}
#[cfg(not(all(feature = "rayon", feature = "std")))]
impl<T> TraitCfg for T {}

#[cfg(all(feature = "rayon", feature = "std"))]
pub trait TraitCfg: Send + Sync {}
#[cfg(all(feature = "rayon", feature = "std"))]
impl<T> TraitCfg for T where T: Send + Sync {}