remove redundant clones

compiler/rustc_infer/src/infer/canonical/canonicalizer.rs

@@ -505,7 +505,7 @@ impl<'cx, 'tcx> Canonicalizer<'cx, 'tcx> {
             let canon_value = Canonical {
                 max_universe: ty::UniverseIndex::ROOT,
                 variables: List::empty(),
-                value: value.clone(),
+                value,
             };
             return canon_value;
         }

compiler/rustc_middle/src/ty/fold.rs

@@ -581,7 +581,7 @@ impl<'tcx> TyCtxt<'tcx> {
         let mut const_map = FxHashMap::default();
 
         if !value.has_escaping_bound_vars() {
-            (value.clone(), region_map)
+            (value, region_map)
         } else {
             let mut real_fld_r = |br| *region_map.entry(br).or_insert_with(|| fld_r(br));
 

compiler/rustc_trait_selection/src/traits/query/normalize.rs

@@ -49,7 +49,7 @@ impl<'cx, 'tcx> AtExt<'tcx> for At<'cx, 'tcx> {
             self.param_env,
         );
         if !value.has_projections() {
-            return Ok(Normalized { value: value.clone(), obligations: vec![] });
+            return Ok(Normalized { value, obligations: vec![] });
         }
 
         let mut normalizer = QueryNormalizer {