Function rustc_hir_analysis::impl_wf_check::min_specialization::check_predicates

fn check_predicates<'tcx>(
    tcx: TyCtxt<'tcx>,
    impl1_def_id: LocalDefId,
    impl1_substs: SubstsRef<'tcx>,
    impl2_node: Node,
    impl2_substs: SubstsRef<'tcx>,
    span: Span
)

Check whether predicates on the specializing impl (impl1) are allowed.

Each predicate P must be one of:

• Global (not reference any parameters).
• A T: Tr predicate where Tr is an always-applicable trait.
• Present on the base impl impl2.
  • This check is done using the trait_predicates_eq function below.
• A well-formed predicate of a type argument of the trait being implemented, including the Self-type.