let cause = ObligationCause::dummy();
let src = ocx.normalize(cause.clone(), param_env, src);
let dest = ocx.normalize(cause.clone(), param_env, dest);
- let Ok(infer_ok) = infcx.at(&cause, param_env).sub(src, dest) else {
- return false;
+ match ocx.sub(&cause, param_env, src, dest) {
+ Ok(()) => {}
+ Err(_) => return false,
};
- let () = ocx.register_infer_ok_obligations(infer_ok);
let errors = ocx.select_all_or_error();
// With `Reveal::All`, opaque types get normalized away, with `Reveal::UserFacing`
// we would get unification errors because we're unable to look into opaque types,
let misc_cause = traits::ObligationCause::misc(span, hir_id);
- match infcx.at(&misc_cause, param_env).eq(opaque_ty, hidden_ty) {
- Ok(infer_ok) => ocx.register_infer_ok_obligations(infer_ok),
+ match ocx.eq(&misc_cause, param_env, opaque_ty, hidden_ty) {
+ Ok(()) => {}
Err(ty_err) => {
tcx.sess.delay_span_bug(
span,
unnormalized_trait_sig.inputs_and_output.iter().chain(trait_sig.inputs_and_output.iter()),
);
- match infcx.at(&cause, param_env).eq(trait_return_ty, impl_return_ty) {
- Ok(infer::InferOk { value: (), obligations }) => {
- ocx.register_obligations(obligations);
- }
+ match ocx.eq(&cause, param_env, trait_return_ty, impl_return_ty) {
+ Ok(()) => {}
Err(terr) => {
let mut diag = struct_span_err!(
tcx.sess,
// the lifetimes of the return type, but do this after unifying just the
// return types, since we want to avoid duplicating errors from
// `compare_predicate_entailment`.
- match infcx.at(&cause, param_env).eq(trait_fty, impl_fty) {
- Ok(infer::InferOk { value: (), obligations }) => {
- ocx.register_obligations(obligations);
- }
+ match ocx.eq(&cause, param_env, trait_fty, impl_fty) {
+ Ok(()) => {}
Err(terr) => {
// This function gets called during `compare_predicate_entailment` when normalizing a
// signature that contains RPITIT. When the method signatures don't match, we have to
.map(|infer_ok| self.register_infer_ok_obligations(infer_ok))
}
+ /// Checks whether `expected` is a subtype of `actual`: `expected <: actual`.
+ pub fn sub<T: ToTrace<'tcx>>(
+ &self,
+ cause: &ObligationCause<'tcx>,
+ param_env: ty::ParamEnv<'tcx>,
+ expected: T,
+ actual: T,
+ ) -> Result<(), TypeError<'tcx>> {
+ self.infcx
+ .at(cause, param_env)
+ .sup(expected, actual)
+ .map(|infer_ok| self.register_infer_ok_obligations(infer_ok))
+ }
+
+ /// Checks whether `expected` is a supertype of `actual`: `expected :> actual`.
pub fn sup<T: ToTrace<'tcx>>(
&self,
cause: &ObligationCause<'tcx>,
expected: T,
actual: T,
) -> Result<(), TypeError<'tcx>> {
- match self.infcx.at(cause, param_env).sup(expected, actual) {
- Ok(InferOk { obligations, value: () }) => {
- self.register_obligations(obligations);
- Ok(())
- }
- Err(e) => Err(e),
- }
+ self.infcx
+ .at(cause, param_env)
+ .sup(expected, actual)
+ .map(|infer_ok| self.register_infer_ok_obligations(infer_ok))
}
pub fn select_where_possible(&self) -> Vec<FulfillmentError<'tcx>> {