Module rustc_trait_selection::traits::coherence

See Rustc Dev Guide chapters on trait-resolution and trait-specialization for more info on how this works.

Structs

• AmbiguityCausesVisitor 🔒
• OrphanChecker 🔒
• OverlapResult

Enums

• Conflict
• InCrate 🔒
  Whether we do the orphan check relative to this crate or to some remote crate.
• OrphanCheckEarlyExit 🔒
• OrphanCheckErr
• TrackAmbiguityCauses 🔒

Functions

• add_placeholder_note
• compute_intercrate_ambiguity_causes 🔒
  Compute the intercrate_ambiguity_causes for the new solver using “proof trees”.
• equate_impl_headers 🔒
• impl_intersection_has_impossible_obligation 🔒
  Check if both impls can be satisfied by a common type by considering whether any of either impl’s obligations is not known to hold.
• impl_intersection_has_negative_obligation 🔒
  Check if both impls can be satisfied by a common type by considering whether any of first impl’s obligations is known not to hold via a negative predicate.
• negative_impl_exists 🔒
  Try to prove that a negative impl exist for the obligation or its supertraits.
• orphan_check
  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:
• orphan_check_trait_ref 🔒
  Checks whether a trait-ref is potentially implementable by a crate.
• overlap 🔒
  Can both impl a and impl b be satisfied by a common type (including where-clauses)? If so, returns an ImplHeader that unifies the two impls.
• overlapping_impls
  If there are types that satisfy both impls, returns Some with a suitably-freshened ImplHeader with those types substituted. Otherwise, returns None.
• prove_negated_obligation 🔒
• search_ambiguity_causes 🔒
• trait_ref_is_knowable
  Returns whether all impls which would apply to the trait_ref e.g. Ty: Trait<Arg> are already known in the local crate.
• trait_ref_is_local_or_fundamental
• with_fresh_ty_vars 🔒