2 files changed, 8 insertions, 10 deletions

diff --git a/crates/ra_hir/src/ty/infer.rs b/crates/ra_hir/src/ty/infer.rs
index a2dc92370..9228dd314 100644
--- a/crates/ra_hir/src/ty/infer.rs
+++ b/crates/ra_hir/src/ty/infer.rs
@@ -116,16 +116,16 @@ pub struct InferenceResult {
 
 impl InferenceResult {
     pub fn method_resolution(&self, expr: ExprId) -> Option<Function> {
-        self.method_resolutions.get(&expr).map(|it| *it)
+        self.method_resolutions.get(&expr).copied()
     }
     pub fn field_resolution(&self, expr: ExprId) -> Option<StructField> {
-        self.field_resolutions.get(&expr).map(|it| *it)
+        self.field_resolutions.get(&expr).copied()
     }
     pub fn assoc_resolutions_for_expr(&self, id: ExprId) -> Option<ImplItem> {
-        self.assoc_resolutions.get(&id.into()).map(|it| *it)
+        self.assoc_resolutions.get(&id.into()).copied()
     }
     pub fn assoc_resolutions_for_pat(&self, id: PatId) -> Option<ImplItem> {
-        self.assoc_resolutions.get(&id.into()).map(|it| *it)
+        self.assoc_resolutions.get(&id.into()).copied()
     }
     pub(crate) fn add_diagnostics(
         &self,
@@ -239,8 +239,7 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
             &self.resolver,
             type_ref,
         );
-        let ty = self.insert_type_vars(ty);
-        ty
+        self.insert_type_vars(ty)
     }
 
     fn unify_substs(&mut self, substs1: &Substs, substs2: &Substs, depth: usize) -> bool {
@@ -973,8 +972,7 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
 
                 for (arg_pat, arg_type) in args.iter().zip(arg_types.iter()) {
                     let expected = if let Some(type_ref) = arg_type {
-                        let ty = self.make_ty(type_ref);
-                        ty
+                        self.make_ty(type_ref)
                     } else {
                         Ty::Unknown
                     };
diff --git a/crates/ra_hir/src/ty/infer/unify.rs b/crates/ra_hir/src/ty/infer/unify.rs
index 04633bdb2..49bf5b946 100644
--- a/crates/ra_hir/src/ty/infer/unify.rs
+++ b/crates/ra_hir/src/ty/infer/unify.rs
@@ -102,7 +102,7 @@ impl<T> Canonicalized<T> {
         ty.fold(&mut |ty| match ty {
             Ty::Bound(idx) => {
                 if (idx as usize) < self.free_vars.len() {
-                    Ty::Infer(self.free_vars[idx as usize].clone())
+                    Ty::Infer(self.free_vars[idx as usize])
                 } else {
                     Ty::Bound(idx)
                 }
@@ -120,7 +120,7 @@ impl<T> Canonicalized<T> {
         let new_vars =
             (0..solution.num_vars).map(|_| ctx.new_type_var()).collect::<Vec<_>>().into();
         for (i, ty) in solution.value.into_iter().enumerate() {
-            let var = self.free_vars[i].clone();
+            let var = self.free_vars[i];
             ctx.unify(&Ty::Infer(var), &ty.subst_bound_vars(&new_vars));
         }
     }