clippy::complexity fixes

compiler/rustc_ast_lowering/src/item.rs

@@ -1345,8 +1345,7 @@ pub(super) fn lower_generics_mut(
                         generics
                             .params
                             .iter()
-                            .find(|p| def_id == self.resolver.local_def_id(p.id).to_def_id())
-                            .is_some()
+                            .any(|p| def_id == self.resolver.local_def_id(p.id).to_def_id())
                     }
                     // Either the `bounded_ty` is not a plain type parameter, or
                     // it's not found in the generic type parameters list.

compiler/rustc_borrowck/src/dataflow.rs

@@ -201,7 +201,7 @@ fn precompute_borrows_out_of_scope(
                 let bb_data = &self.body[bb];
                 debug_assert!(hi == bb_data.statements.len());
                 for &succ_bb in bb_data.terminator().successors() {
-                    if self.visited.insert(succ_bb) == false {
+                    if !self.visited.insert(succ_bb) {
                         if succ_bb == location.block && first_lo > 0 {
                             // `succ_bb` has been seen before. If it wasn't
                             // fully processed, add its first part to `stack`

compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs

@@ -972,8 +972,7 @@ fn suggest_ampmut<'tcx>(
     if let Some(assignment_rhs_span) = opt_assignment_rhs_span {
         if let Ok(src) = tcx.sess.source_map().span_to_snippet(assignment_rhs_span) {
             let is_mutbl = |ty: &str| -> bool {
-                if ty.starts_with("mut") {
-                    let rest = &ty[3..];
+                if let Some(rest) = ty.strip_prefix("mut") {
                     match rest.chars().next() {
                         // e.g. `&mut x`
                         Some(c) if c.is_whitespace() => true,

compiler/rustc_builtin_macros/src/deriving/generic/mod.rs

@@ -594,7 +594,7 @@ fn create_derived_impl(
             GenericParamKind::Const { ty, kw_span, .. } => {
                 let const_nodefault_kind = GenericParamKind::Const {
                     ty: ty.clone(),
-                    kw_span: kw_span.clone(),
+                    kw_span: *kw_span,
 
                     // We can't have default values inside impl block
                     default: None,

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/trait_impl_difference.rs

@@ -130,8 +130,8 @@ fn emit_associated_type_err(
             .tcx()
             .sess
             .struct_span_err(span, &format!("`impl` associated type signature for `{}` doesn't match `trait` associated type signature", item_name));
-        err.span_label(impl_sp, &format!("found"));
-        err.span_label(trait_sp, &format!("expected"));
+        err.span_label(impl_sp, "found");
+        err.span_label(trait_sp, "expected");
 
         err.emit();
     }

compiler/rustc_lint/src/non_fmt_panic.rs

@@ -230,8 +230,7 @@ fn check_panic_str<'tcx>(
         Err(_) => (None, None),
     };
 
-    let mut fmt_parser =
-        Parser::new(fmt.as_ref(), style, snippet.clone(), false, ParseMode::Format);
+    let mut fmt_parser = Parser::new(fmt, style, snippet.clone(), false, ParseMode::Format);
     let n_arguments = (&mut fmt_parser).filter(|a| matches!(a, Piece::NextArgument(_))).count();
 
     if n_arguments > 0 && fmt_parser.errors.is_empty() {

compiler/rustc_metadata/src/native_libs.rs

@@ -363,7 +363,7 @@ fn process_command_line(&mut self) {
                 .collect::<Vec<_>>();
             if existing.is_empty() {
                 // Add if not found
-                let new_name = passed_lib.new_name.as_ref().map(|s| &**s); // &Option<String> -> Option<&str>
+                let new_name: Option<&str> = passed_lib.new_name.as_deref();
                 let lib = NativeLib {
                     name: Some(Symbol::intern(new_name.unwrap_or(&passed_lib.name))),
                     kind: passed_lib.kind,

compiler/rustc_middle/src/ty/layout.rs

@@ -986,7 +986,7 @@ fn layout_of_uncached(&self, ty: Ty<'tcx>) -> Result<&'tcx Layout, LayoutError<'
                             let niche = if def.repr.hide_niche() {
                                 None
                             } else {
-                                Niche::from_scalar(dl, Size::ZERO, scalar.clone())
+                                Niche::from_scalar(dl, Size::ZERO, *scalar)
                             };
                             if let Some(niche) = niche {
                                 match st.largest_niche {
@@ -2273,7 +2273,7 @@ fn field_ty_or_layout(
         ) -> TyMaybeWithLayout<'tcx> {
             let tcx = cx.tcx();
             let tag_layout = |tag: Scalar| -> TyAndLayout<'tcx> {
-                let layout = Layout::scalar(cx, tag.clone());
+                let layout = Layout::scalar(cx, tag);
                 TyAndLayout { layout: tcx.intern_layout(layout), ty: tag.value.to_ty(tcx) }
             };
 

compiler/rustc_mir_build/src/build/expr/as_rvalue.rs

@@ -130,7 +130,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                     TerminatorKind::Call {
                         func: exchange_malloc,
                         args: vec![Operand::Move(size), Operand::Move(align)],
-                        destination: Some((Place::from(storage), success)),
+                        destination: Some((storage, success)),
                         cleanup: None,
                         from_hir_call: false,
                         fn_span: expr_span,
@@ -153,7 +153,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                 }
 
                 // Transmute `*mut u8` to the box (thus far, uninitialized):
-                let box_ = Rvalue::ShallowInitBox(Operand::Move(Place::from(storage)), value.ty);
+                let box_ = Rvalue::ShallowInitBox(Operand::Move(storage), value.ty);
                 this.cfg.push_assign(block, source_info, Place::from(result), box_);
 
                 // initialize the box contents:

compiler/rustc_mir_build/src/thir/pattern/deconstruct_pat.rs

@@ -1068,9 +1068,7 @@ pub(super) fn iter_missing<'a, 'p>(
                     Missing {
                         nonexhaustive_enum_missing_real_variants: self
                             .iter_missing(pcx)
-                            .filter(|c| !c.is_non_exhaustive())
-                            .next()
-                            .is_some(),
+                            .any(|c| !c.is_non_exhaustive()),
                     }
                 } else {
                     Missing { nonexhaustive_enum_missing_real_variants: false }

compiler/rustc_mir_transform/src/early_otherwise_branch.rs

@@ -263,7 +263,7 @@ fn find_discriminant_switch_pairing(
             }
 
             // check that the value being matched on is the same. The
-            if this_bb_discr_info.targets_with_values.iter().find(|x| x.0 == value).is_none() {
+            if !this_bb_discr_info.targets_with_values.iter().any(|x| x.0 == value) {
                 trace!("NO: values being matched on are not the same");
                 return None;
             }

compiler/rustc_mir_transform/src/normalize_array_len.rs

@@ -111,8 +111,7 @@ fn patch_expand_statement(
                         Operand::Copy(place) | Operand::Move(place) => {
                             // create new local
                             let ty = operand.ty(self.local_decls, self.tcx);
-                            let local_decl =
-                                LocalDecl::with_source_info(ty, statement.source_info.clone());
+                            let local_decl = LocalDecl::with_source_info(ty, statement.source_info);
                             let local = self.local_decls.push(local_decl);
                             // make it live
                             let mut make_live_statement = statement.clone();

compiler/rustc_passes/src/check_attr.rs

@@ -1766,8 +1766,7 @@ fn check_macro_use(&self, hir_id: HirId, attr: &Attribute, target: Target) {
     fn check_macro_export(&self, hir_id: HirId, attr: &Attribute, target: Target) {
         if target != Target::MacroDef {
             self.tcx.struct_span_lint_hir(UNUSED_ATTRIBUTES, hir_id, attr.span, |lint| {
-                lint.build(&format!("`#[macro_export]` only has an effect on macro definitions"))
-                    .emit();
+                lint.build("`#[macro_export]` only has an effect on macro definitions").emit();
             });
         }
     }

compiler/rustc_trait_selection/src/traits/const_evaluatable.rs

@@ -278,14 +278,14 @@ fn thir(&self) -> &'a thir::Thir<'tcx> {
 
             fn visit_expr(&mut self, expr: &thir::Expr<'tcx>) {
                 self.is_poly |= expr.ty.definitely_has_param_types_or_consts(self.tcx);
-                if self.is_poly == false {
+                if !self.is_poly {
                     visit::walk_expr(self, expr)
                 }
             }
 
             fn visit_pat(&mut self, pat: &thir::Pat<'tcx>) {
                 self.is_poly |= pat.ty.definitely_has_param_types_or_consts(self.tcx);
-                if self.is_poly == false {
+                if !self.is_poly {
                     visit::walk_pat(self, pat);
                 }
             }
@@ -298,7 +298,7 @@ fn visit_const(&mut self, ct: &'tcx ty::Const<'tcx>) {
         let mut is_poly_vis = IsThirPolymorphic { is_poly: false, thir: body, tcx };
         visit::walk_expr(&mut is_poly_vis, &body[body_id]);
         debug!("AbstractConstBuilder: is_poly={}", is_poly_vis.is_poly);
-        if is_poly_vis.is_poly == false {
+        if !is_poly_vis.is_poly {
             return Ok(None);
         }
 

compiler/rustc_traits/src/chalk/lowering.rs

@@ -892,7 +892,7 @@ fn visit_region(&mut self, r: Region<'tcx>) -> ControlFlow<Self::BreakTy> {
         match r {
             ty::ReLateBound(index, br) if *index == self.binder_index => match br.kind {
                 ty::BoundRegionKind::BrNamed(def_id, _name) => {
-                    if self.named_parameters.iter().find(|d| **d == def_id).is_none() {
+                    if !self.named_parameters.iter().any(|d| *d == def_id) {
                         self.named_parameters.push(def_id);
                     }
                 }

compiler/rustc_typeck/src/check/callee.rs

@@ -329,7 +329,7 @@ fn confirm_builtin_call(
                         let obligation = Obligation::new(
                             ObligationCause::dummy_with_span(callee_expr.span),
                             self.param_env,
-                            predicate.clone(),
+                            *predicate,
                         );
                         let result = self.infcx.evaluate_obligation(&obligation);
                         self.tcx

compiler/rustc_typeck/src/check/regionck.rs

@@ -413,7 +413,7 @@ fn visit_expr(&mut self, expr: &'tcx hir::Expr<'tcx>) {
             }
 
             hir::ExprKind::Match(ref discr, arms, _) => {
-                self.link_match(discr, &arms[..]);
+                self.link_match(discr, arms);
 
                 intravisit::walk_expr(self, expr);
             }

src/librustdoc/json/mod.rs

@@ -207,7 +207,7 @@ fn after_krate(&mut self) -> Result<(), Error> {
         debug!("Done with crate");
 
         for primitive in Rc::clone(&self.cache).primitive_locations.values() {
-            self.get_impls(primitive.clone());
+            self.get_impls(*primitive);
         }
 
         let mut index = (*self.index).clone().into_inner();