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#[cfg(not(feature = "with-futures"))]
pub trait TraitCfg {}
#[cfg(not(feature = "with-futures"))]
impl<T> TraitCfg for T {}

#[cfg(feature = "with-futures")]
pub trait TraitCfg: Send + Sync {}
#[cfg(feature = "with-futures")]
impl<T> TraitCfg for T where T: Send + Sync {}