1 2 3 4 5
pub trait CrdbFn<Arg>: waaaa::Send + Fn(Arg) {} impl<Arg, F: waaaa::Send + Fn(Arg)> CrdbFn<Arg> for F {} pub trait CrdbSyncFn<Arg>: waaaa::Send + waaaa::Sync + Fn(Arg) {} impl<Arg, F: waaaa::Send + waaaa::Sync + Fn(Arg)> CrdbSyncFn<Arg> for F {}