handle specialization in the new trait solver

uwu :3

compiler/rustc_next_trait_solver/src/solve/trait_goals.rs

@@ -13,7 +13,7 @@ use tracing::{instrument, trace};
 
 use crate::delegate::SolverDelegate;
 use crate::solve::assembly::structural_traits::{self, AsyncCallableRelevantTypes};
-use crate::solve::assembly::{self, AssembleCandidatesFrom, Candidate};
+use crate::solve::assembly::{self, AllowInferenceConstraints, AssembleCandidatesFrom, Candidate};
 use crate::solve::inspect::ProbeKind;
 use crate::solve::{
     BuiltinImplSource, CandidateSource, Certainty, EvalCtxt, Goal, GoalSource, MaybeCause,
@@ -1338,6 +1338,8 @@ where
             };
         }
 
+        self.filter_specialized_impls(AllowInferenceConstraints::No, &mut candidates);
+
         // If there are *only* global where bounds, then make sure to return that this
         // is still reported as being proven-via the param-env so that rigid projections
         // operate correctly. Otherwise, drop all global where-bounds before merging the