Function rustc_typeck::coherence::unsafety::check_unsafety_coherence

fn check_unsafety_coherence<'tcx>(
    tcx: TyCtxt<'tcx>, 
    item: &Item<'_>, 
    impl_generics: Option<&Generics<'_>>, 
    unsafety: Unsafety, 
    polarity: ImplPolarity
)