rustc_middle::ty::significant_drop_order

Function true_significant_drop_ty

Source 
fn true_significant_drop_ty<'tcx>(
    tcx: TyCtxt<'tcx>,
    ty: Ty<'tcx>,
) -> Option<SmallVec<[Ty<'tcx>; 2]>>
Expand description

An additional filter to exclude well-known types from the ecosystem because their drops are trivial. This returns additional types to check if the drops are delegated to those. A typical example is hashbrown::HashMap<K, V>, whose drop is delegated to K and V.