Auto merge of #100982 - fee1-dead-contrib:const-impl-requires-const-trait, r=oli-obk

Require `#[const_trait]` on `Trait` for `impl const Trait`

r? `@oli-obk`

compiler/rustc_trait_selection/src/traits/mod.rs

@@ -129,7 +129,7 @@ pub fn predicates_for_generics<'tcx>(
         move |(idx, (predicate, span))| Obligation {
             cause: cause(idx, span),
             recursion_depth: 0,
-            param_env: param_env,
+            param_env,
             predicate,
         },
     )

compiler/rustc_trait_selection/src/traits/wf.rs

@@ -392,7 +392,8 @@ impl<'tcx> WfPredicates<'tcx> {
         //     `i32: Clone`
         //     `i32: Copy`
         // ]
-        let obligations = self.nominal_obligations(data.item_def_id, data.substs);
+        // Projection types do not require const predicates.
+        let obligations = self.nominal_obligations_without_const(data.item_def_id, data.substs);
         self.out.extend(obligations);
 
         let tcx = self.tcx();