Use SolverRelating in new solver

compiler/rustc_infer/src/infer/at.rs

@@ -208,49 +208,6 @@ impl<'a, 'tcx> At<'a, 'tcx> {
         }
     }
 
-    /// Used in the new solver since we don't care about tracking an `ObligationCause`.
-    pub fn relate_no_trace<T>(
-        self,
-        expected: T,
-        variance: ty::Variance,
-        actual: T,
-    ) -> Result<Vec<Goal<'tcx, ty::Predicate<'tcx>>>, NoSolution>
-    where
-        T: Relate<TyCtxt<'tcx>>,
-    {
-        let mut op = TypeRelating::new(
-            self.infcx,
-            TypeTrace::dummy(self.cause),
-            self.param_env,
-            DefineOpaqueTypes::Yes,
-            StructurallyRelateAliases::No,
-            variance,
-        );
-        op.relate(expected, actual)?;
-        Ok(op.into_obligations().into_iter().map(|o| o.into()).collect())
-    }
-
-    /// Used in the new solver since we don't care about tracking an `ObligationCause`.
-    pub fn eq_structurally_relating_aliases_no_trace<T>(
-        self,
-        expected: T,
-        actual: T,
-    ) -> Result<Vec<Goal<'tcx, ty::Predicate<'tcx>>>, NoSolution>
-    where
-        T: Relate<TyCtxt<'tcx>>,
-    {
-        let mut op = TypeRelating::new(
-            self.infcx,
-            TypeTrace::dummy(self.cause),
-            self.param_env,
-            DefineOpaqueTypes::Yes,
-            StructurallyRelateAliases::Yes,
-            ty::Invariant,
-        );
-        op.relate(expected, actual)?;
-        Ok(op.into_obligations().into_iter().map(|o| o.into()).collect())
-    }
-
     /// Computes the least-upper-bound, or mutual supertype, of two
     /// values. The order of the arguments doesn't matter, but since
     /// this can result in an error (e.g., if asked to compute LUB of

compiler/rustc_infer/src/infer/context.rs

@@ -2,10 +2,10 @@
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_middle::infer::unify_key::EffectVarValue;
 use rustc_middle::traits::ObligationCause;
-use rustc_middle::traits::solve::{Goal, NoSolution, SolverMode};
+use rustc_middle::traits::solve::SolverMode;
 use rustc_middle::ty::fold::TypeFoldable;
+use rustc_middle::ty::relate::RelateResult;
 use rustc_middle::ty::relate::combine::PredicateEmittingRelation;
-use rustc_middle::ty::relate::{Relate, RelateResult};
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_span::{DUMMY_SP, ErrorGuaranteed};
 
@@ -210,26 +210,6 @@ impl<'tcx> rustc_type_ir::InferCtxtLike for InferCtxt<'tcx> {
         self.set_tainted_by_errors(e)
     }
 
-    fn relate<T: Relate<TyCtxt<'tcx>>>(
-        &self,
-        param_env: ty::ParamEnv<'tcx>,
-        lhs: T,
-        variance: ty::Variance,
-        rhs: T,
-    ) -> Result<Vec<Goal<'tcx, ty::Predicate<'tcx>>>, NoSolution> {
-        self.at(&ObligationCause::dummy(), param_env).relate_no_trace(lhs, variance, rhs)
-    }
-
-    fn eq_structurally_relating_aliases<T: Relate<TyCtxt<'tcx>>>(
-        &self,
-        param_env: ty::ParamEnv<'tcx>,
-        lhs: T,
-        rhs: T,
-    ) -> Result<Vec<Goal<'tcx, ty::Predicate<'tcx>>>, NoSolution> {
-        self.at(&ObligationCause::dummy(), param_env)
-            .eq_structurally_relating_aliases_no_trace(lhs, rhs)
-    }
-
     fn shallow_resolve(&self, ty: Ty<'tcx>) -> Ty<'tcx> {
         self.shallow_resolve(ty)
     }

compiler/rustc_infer/src/infer/mod.rs

@@ -32,7 +32,6 @@ use rustc_middle::infer::unify_key::{
 use rustc_middle::mir::ConstraintCategory;
 use rustc_middle::mir::interpret::{ErrorHandled, EvalToValTreeResult};
 use rustc_middle::traits::select;
-use rustc_middle::traits::solve::{Goal, NoSolution};
 pub use rustc_middle::ty::IntVarValue;
 use rustc_middle::ty::error::{ExpectedFound, TypeError};
 use rustc_middle::ty::fold::{
@@ -340,7 +339,6 @@ pub enum ValuePairs<'tcx> {
     PolySigs(ExpectedFound<ty::PolyFnSig<'tcx>>),
     ExistentialTraitRef(ExpectedFound<ty::PolyExistentialTraitRef<'tcx>>),
     ExistentialProjection(ExpectedFound<ty::PolyExistentialProjection<'tcx>>),
-    Dummy,
 }
 
 impl<'tcx> ValuePairs<'tcx> {
@@ -1638,10 +1636,6 @@ impl<'tcx> TypeTrace<'tcx> {
             values: ValuePairs::Terms(ExpectedFound::new(a_is_expected, a.into(), b.into())),
         }
     }
-
-    fn dummy(cause: &ObligationCause<'tcx>) -> TypeTrace<'tcx> {
-        TypeTrace { cause: cause.clone(), values: ValuePairs::Dummy }
-    }
 }
 
 impl<'tcx> SubregionOrigin<'tcx> {

compiler/rustc_infer/src/infer/relate/mod.rs

@@ -6,7 +6,6 @@ pub use rustc_middle::ty::relate::RelateResult;
 pub use rustc_type_ir::relate::combine::PredicateEmittingRelation;
 pub use rustc_type_ir::relate::*;
 
-#[allow(hidden_glob_reexports)]
 mod generalize;
 mod higher_ranked;
 pub(super) mod lattice;