Uplift the new trait solver

compiler/rustc_next_trait_solver/src/solve/project_goals.rs

@@ -0,0 +1,29 @@
+use rustc_type_ir::{self as ty, Interner, ProjectionPredicate};
+
+use crate::infcx::SolverDelegate;
+use crate::solve::{Certainty, EvalCtxt, Goal, GoalSource, QueryResult};
+
+impl<Infcx, I> EvalCtxt<'_, Infcx>
+where
+    Infcx: SolverDelegate<Interner = I>,
+    I: Interner,
+{
+    #[instrument(level = "trace", skip(self), ret)]
+    pub(super) fn compute_projection_goal(
+        &mut self,
+        goal: Goal<I, ProjectionPredicate<I>>,
+    ) -> QueryResult<I> {
+        let tcx = self.interner();
+        let projection_term = goal.predicate.projection_term.to_term(tcx);
+        let goal = goal.with(
+            tcx,
+            ty::PredicateKind::AliasRelate(
+                projection_term,
+                goal.predicate.term,
+                ty::AliasRelationDirection::Equate,
+            ),
+        );
+        self.add_goal(GoalSource::Misc, goal);
+        self.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)
+    }
+}