Function rustc_trait_selection::traits::coherence::orphan_check

source · 
pub fn orphan_check(
    tcx: TyCtxt<'_>,
    impl_def_id: DefId
) -> Result<(), OrphanCheckErr<'_>>
Expand description

Checks the coherence orphan rules. impl_def_id should be the DefId of a trait impl. To pass, either the trait must be local, or else two conditions must be satisfied:

  1. All type parameters in Self must be “covered” by some local type constructor.
  2. Some local type must appear in Self.