Rollup merge of rust-lang#75270 - matthiaskrgr:clippy_aug_1, r=Dylan-DPC

fix a couple of clippy findings

Author: JohnTitor

library/test/src/helpers/concurrency.rs

@@ -4,7 +4,7 @@ use std::env;
 
 #[allow(deprecated)]
 pub fn get_concurrency() -> usize {
-    return match env::var("RUST_TEST_THREADS") {
+    match env::var("RUST_TEST_THREADS") {
         Ok(s) => {
             let opt_n: Option<usize> = s.parse().ok();
             match opt_n {
@@ -13,7 +13,7 @@ pub fn get_concurrency() -> usize {
             }
         }
         Err(..) => num_cpus(),
-    };
+    }
 }
 
 cfg_if::cfg_if! {

src/librustc_codegen_llvm/debuginfo/metadata.rs

@@ -960,15 +960,15 @@ fn pointer_type_metadata(
 fn param_type_metadata(cx: &CodegenCx<'ll, 'tcx>, t: Ty<'tcx>) -> &'ll DIType {
     debug!("param_type_metadata: {:?}", t);
     let name = format!("{:?}", t);
-    return unsafe {
+    unsafe {
         llvm::LLVMRustDIBuilderCreateBasicType(
             DIB(cx),
             name.as_ptr().cast(),
             name.len(),
             Size::ZERO.bits(),
             DW_ATE_unsigned,
         )
-    };
+    }
 }
 
 pub fn compile_unit_metadata(

src/librustc_codegen_ssa/back/write.rs

@@ -490,7 +490,7 @@ fn copy_all_cgu_workproducts_to_incr_comp_cache_dir(
     let _timer = sess.timer("copy_all_cgu_workproducts_to_incr_comp_cache_dir");
 
     for module in compiled_modules.modules.iter().filter(|m| m.kind == ModuleKind::Regular) {
-        let path = module.object.as_ref().map(|path| path.clone());
+        let path = module.object.as_ref().cloned();
 
         if let Some((id, product)) =
             copy_cgu_workproduct_to_incr_comp_cache_dir(sess, &module.name, &path)

src/librustc_infer/infer/error_reporting/nice_region_error/named_anon_conflict.rs

@@ -85,11 +85,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
 
                 debug!("try_report_named_anon_conflict: ret ty {:?}", ty);
                 if sub == &ty::ReStatic
-                    && v.0
-                        .into_iter()
-                        .filter(|t| t.span.desugaring_kind().is_none())
-                        .next()
-                        .is_some()
+                    && v.0.into_iter().find(|t| t.span.desugaring_kind().is_none()).is_some()
                 {
                     // If the failure is due to a `'static` requirement coming from a `dyn` or
                     // `impl` Trait that *isn't* caused by `async fn` desugaring, handle this case

src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs

@@ -257,7 +257,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
                             param.param_ty.to_string(),
                             Applicability::MaybeIncorrect,
                         );
-                    } else if let Some(_) = opaque
+                    } else if opaque
                         .bounds
                         .iter()
                         .filter_map(|arg| match arg {
@@ -269,6 +269,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
                             _ => None,
                         })
                         .next()
+                        .is_some()
                     {
                     } else {
                         err.span_suggestion_verbose(

src/librustc_infer/infer/glb.rs

@@ -50,7 +50,7 @@ impl TypeRelation<'tcx> for Glb<'combine, 'infcx, 'tcx> {
             ty::Invariant => self.fields.equate(self.a_is_expected).relate(a, b),
             ty::Covariant => self.relate(a, b),
             // FIXME(#41044) -- not correct, need test
-            ty::Bivariant => Ok(a.clone()),
+            ty::Bivariant => Ok(a),
             ty::Contravariant => self.fields.lub(self.a_is_expected).relate(a, b),
         }
     }
@@ -97,7 +97,7 @@ impl TypeRelation<'tcx> for Glb<'combine, 'infcx, 'tcx> {
         // very challenging, switch to invariance. This is obviously
         // overly conservative but works ok in practice.
         self.relate_with_variance(ty::Variance::Invariant, a, b)?;
-        Ok(a.clone())
+        Ok(a)
     }
 }
 

src/librustc_infer/infer/nll_relate/mod.rs

@@ -719,7 +719,7 @@ where
             self.a_scopes.pop().unwrap();
         }
 
-        Ok(a.clone())
+        Ok(a)
     }
 }
 

src/librustc_infer/infer/region_constraints/leak_check.rs

@@ -288,9 +288,9 @@ impl<'me, 'tcx> LeakCheck<'me, 'tcx> {
     ) -> TypeError<'tcx> {
         debug!("error: placeholder={:?}, other_region={:?}", placeholder, other_region);
         if self.overly_polymorphic {
-            return TypeError::RegionsOverlyPolymorphic(placeholder.name, other_region);
+            TypeError::RegionsOverlyPolymorphic(placeholder.name, other_region)
         } else {
-            return TypeError::RegionsInsufficientlyPolymorphic(placeholder.name, other_region);
+            TypeError::RegionsInsufficientlyPolymorphic(placeholder.name, other_region)
         }
     }
 }

src/librustc_infer/infer/sub.rs

@@ -68,7 +68,7 @@ impl TypeRelation<'tcx> for Sub<'combine, 'infcx, 'tcx> {
         match variance {
             ty::Invariant => self.fields.equate(self.a_is_expected).relate(a, b),
             ty::Covariant => self.relate(a, b),
-            ty::Bivariant => Ok(a.clone()),
+            ty::Bivariant => Ok(a),
             ty::Contravariant => self.with_expected_switched(|this| this.relate(b, a)),
         }
     }

src/librustc_lint/types.rs

@@ -1074,7 +1074,7 @@ impl<'a, 'tcx> ImproperCTypesVisitor<'a, 'tcx> {
             }
             // If `ty` is a `repr(transparent)` newtype, and the non-zero-sized type is a generic
             // argument, which after substitution, is `()`, then this branch can be hit.
-            FfiResult::FfiUnsafe { ty, .. } if is_return_type && ty.is_unit() => return,
+            FfiResult::FfiUnsafe { ty, .. } if is_return_type && ty.is_unit() => {}
             FfiResult::FfiUnsafe { ty, reason, help } => {
                 self.emit_ffi_unsafe_type_lint(ty, sp, &reason, help.as_deref());
             }