Add explicit_predicates_of to SMIR

compiler/rustc_smir/src/rustc_smir/mod.rs

@@ -135,6 +135,23 @@ fn predicates_of(&mut self, def_id: stable_mir::DefId) -> stable_mir::ty::Generi
                 .collect(),
         }
     }
+
+    fn explicit_predicates_of(
+        &mut self,
+        def_id: stable_mir::DefId,
+    ) -> stable_mir::ty::GenericPredicates {
+        let def_id = self[def_id];
+        let ty::GenericPredicates { parent, predicates } = self.tcx.explicit_predicates_of(def_id);
+        stable_mir::ty::GenericPredicates {
+            parent: parent.map(|did| self.trait_def(did)),
+            predicates: predicates
+                .iter()
+                .map(|(clause, span)| {
+                    (clause.as_predicate().kind().skip_binder().stable(self), span.stable(self))
+                })
+                .collect(),
+        }
+    }
 }
 
 #[derive(Clone)]

compiler/rustc_smir/src/stable_mir/mod.rs

@@ -149,6 +149,7 @@ pub trait Context {
     fn trait_impl(&mut self, trait_impl: &ImplDef) -> ImplTrait;
     fn generics_of(&mut self, def_id: DefId) -> Generics;
     fn predicates_of(&mut self, def_id: DefId) -> GenericPredicates;
+    fn explicit_predicates_of(&mut self, def_id: DefId) -> GenericPredicates;
     /// Get information about the local crate.
     fn local_crate(&self) -> Crate;
     /// Retrieve a list of all external crates.

compiler/rustc_smir/src/stable_mir/ty.rs

@@ -395,6 +395,10 @@ pub fn generics_of(&self) -> Generics {
     pub fn predicates_of(&self) -> GenericPredicates {
         with(|cx| cx.predicates_of(self.def_id.0))
     }
+
+    pub fn explicit_predicates_of(&self) -> GenericPredicates {
+        with(|cx| cx.explicit_predicates_of(self.def_id.0))
+    }
 }
 
 pub type ImplTrait = EarlyBinder<TraitRef>;