don't clone Copy types

compiler/rustc_borrowck/src/constraints/graph.rs

@@ -148,7 +148,7 @@ impl<'s, 'tcx, D: ConstraintGraphDirecton> Iterator for Edges<'s, 'tcx, D> {
         if let Some(p) = self.pointer {
             self.pointer = self.graph.next_constraints[p];
 
-            Some(self.constraints[p].clone())
+            Some(self.constraints[p])
         } else if let Some(next_static_idx) = self.next_static_idx {
             self.next_static_idx = if next_static_idx == (self.graph.first_constraints.len() - 1) {
                 None

compiler/rustc_borrowck/src/type_check/mod.rs

@@ -612,7 +612,7 @@ impl<'a, 'b, 'tcx> TypeVerifier<'a, 'b, 'tcx> {
 
         let locations = location.to_locations();
         for constraint in constraints.outlives().iter() {
-            let mut constraint = constraint.clone();
+            let mut constraint = *constraint;
             constraint.locations = locations;
             if let ConstraintCategory::Return(_)
             | ConstraintCategory::UseAsConst

compiler/rustc_hir_typeck/src/coercion.rs

@@ -1548,7 +1548,7 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
                             cause,
                             expected,
                             found,
-                            coercion_error.clone(),
+                            coercion_error,
                             fcx,
                             parent_id,
                             expression,
@@ -1567,7 +1567,7 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
                             cause,
                             expected,
                             found,
-                            coercion_error.clone(),
+                            coercion_error,
                             fcx,
                             id,
                             expression,
@@ -1583,7 +1583,7 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
                             cause,
                             expected,
                             found,
-                            coercion_error.clone(),
+                            coercion_error,
                         );
                     }
                 }

compiler/rustc_hir_typeck/src/demand.rs

@@ -163,7 +163,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         let expr = expr.peel_drop_temps();
         let cause = self.misc(expr.span);
         let expr_ty = self.resolve_vars_with_obligations(checked_ty);
-        let mut err = self.err_ctxt().report_mismatched_types(&cause, expected, expr_ty, e.clone());
+        let mut err = self.err_ctxt().report_mismatched_types(&cause, expected, expr_ty, e);
 
         let is_insufficiently_polymorphic =
             matches!(e, TypeError::RegionsInsufficientlyPolymorphic(..));

compiler/rustc_interface/src/queries.rs

@@ -127,7 +127,7 @@ impl<'tcx> Queries<'tcx> {
 
     pub fn register_plugins(&self) -> Result<&Query<(ast::Crate, Lrc<LintStore>)>> {
         self.register_plugins.compute(|| {
-            let crate_name = self.crate_name()?.peek().clone();
+            let crate_name = *self.crate_name()?.peek();
             let krate = self.parse()?.take();
 
             let empty: &(dyn Fn(&Session, &mut LintStore) + Sync + Send) = &|_, _| {};

compiler/rustc_lint/src/builtin.rs

@@ -270,7 +270,7 @@ impl<'tcx> LateLintPass<'tcx> for NonShorthandFieldPatterns {
                             |lint| {
                                 let suggested_ident =
                                     format!("{}{}", binding_annot.prefix_str(), ident);
-                                lint.set_arg("ident", ident.clone()).span_suggestion(
+                                lint.set_arg("ident", ident).span_suggestion(
                                     fieldpat.span,
                                     fluent::suggestion,
                                     suggested_ident,
@@ -2052,7 +2052,7 @@ impl KeywordIdents {
             ident.span,
             fluent::lint_builtin_keyword_idents,
             |lint| {
-                lint.set_arg("kw", ident.clone()).set_arg("next", next_edition).span_suggestion(
+                lint.set_arg("kw", ident).set_arg("next", next_edition).span_suggestion(
                     ident.span,
                     fluent::suggestion,
                     format!("r#{}", ident),

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -332,7 +332,7 @@ impl<'a, 'tcx> Encodable<EncodeContext<'a, 'tcx>> for Symbol {
                     s.emit_str(self.as_str());
                 }
                 Entry::Occupied(o) => {
-                    let x = o.get().clone();
+                    let x = *o.get();
                     s.emit_u8(SYMBOL_OFFSET);
                     s.emit_usize(x);
                 }

compiler/rustc_query_impl/src/on_disk_cache.rs

@@ -965,7 +965,7 @@ impl<'a, 'tcx> Encodable<CacheEncoder<'a, 'tcx>> for Symbol {
                     s.emit_str(self.as_str());
                 }
                 Entry::Occupied(o) => {
-                    let x = o.get().clone();
+                    let x = *o.get();
                     s.emit_u8(SYMBOL_OFFSET);
                     s.emit_usize(x);
                 }

compiler/rustc_resolve/src/lib.rs

@@ -1491,7 +1491,7 @@ impl<'a> Resolver<'a> {
             label_res_map: self.label_res_map.clone(),
             lifetimes_res_map: self.lifetimes_res_map.clone(),
             extra_lifetime_params_map: self.extra_lifetime_params_map.clone(),
-            next_node_id: self.next_node_id.clone(),
+            next_node_id: self.next_node_id,
             node_id_to_def_id: self.node_id_to_def_id.clone(),
             def_id_to_node_id: self.def_id_to_node_id.clone(),
             trait_map: self.trait_map.clone(),

compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs

@@ -1574,7 +1574,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                     &error.obligation.cause,
                     expected_found.expected,
                     expected_found.found,
-                    err.clone(),
+                    *err,
                 )
                 .emit();
             }
@@ -1583,7 +1583,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                     &error.obligation.cause,
                     expected_found.expected,
                     expected_found.found,
-                    err.clone(),
+                    *err,
                 );
                 let code = error.obligation.cause.code().peel_derives().peel_match_impls();
                 if let ObligationCauseCode::BindingObligation(..)

compiler/rustc_transmute/src/layout/nfa.rs

@@ -123,7 +123,7 @@ where
             let fix_state = |state| if state == other.start { self.accepting } else { state };
             let entry = transitions.entry(fix_state(source)).or_default();
             for (edge, destinations) in transition {
-                let entry = entry.entry(edge.clone()).or_default();
+                let entry = entry.entry(edge).or_default();
                 for destination in destinations {
                     entry.insert(fix_state(destination));
                 }
@@ -147,7 +147,7 @@ where
             }
             let entry = transitions.entry(source).or_default();
             for (edge, destinations) in transition {
-                let entry = entry.entry(edge.clone()).or_default();
+                let entry = entry.entry(*edge).or_default();
                 for &(mut destination) in destinations {
                     // if dest is accepting state of `other`, replace with accepting state of `self`
                     if destination == other.accepting {