9 files changed, 24 insertions, 30 deletions

diff --git a/crates/ra_hir/src/code_model/docs.rs b/crates/ra_hir/src/code_model/docs.rs
index f696307a7..007ef315d 100644
--- a/crates/ra_hir/src/code_model/docs.rs
+++ b/crates/ra_hir/src/code_model/docs.rs
@@ -74,7 +74,7 @@ pub(crate) fn documentation_query(
         DocDef::Module(it) => docs_from_ast(&*it.declaration_source(db)?.ast),
         DocDef::StructField(it) => match it.source(db).ast {
             FieldSource::Named(named) => docs_from_ast(&*named),
-            FieldSource::Pos(..) => return None,
+            FieldSource::Pos(..) => None,
         },
         DocDef::Struct(it) => docs_from_ast(&*it.source(db).ast),
         DocDef::Enum(it) => docs_from_ast(&*it.source(db).ast),
diff --git a/crates/ra_hir/src/expr.rs b/crates/ra_hir/src/expr.rs
index d5b4ba6b6..3e763fef0 100644
--- a/crates/ra_hir/src/expr.rs
+++ b/crates/ra_hir/src/expr.rs
@@ -150,7 +150,7 @@ impl BodySourceMap {
     }
 
     pub(crate) fn field_syntax(&self, expr: ExprId, field: usize) -> AstPtr<ast::NamedField> {
-        self.field_map[&(expr, field)].clone()
+        self.field_map[&(expr, field)]
     }
 }
 
@@ -471,15 +471,15 @@ impl Pat {
         match self {
             Pat::Range { .. } | Pat::Lit(..) | Pat::Path(..) | Pat::Wild | Pat::Missing => {}
             Pat::Bind { subpat, .. } => {
-                subpat.iter().map(|pat| *pat).for_each(f);
+                subpat.iter().copied().for_each(f);
             }
             Pat::Tuple(args) | Pat::TupleStruct { args, .. } => {
-                args.iter().map(|pat| *pat).for_each(f);
+                args.iter().copied().for_each(f);
             }
             Pat::Ref { pat, .. } => f(*pat),
             Pat::Slice { prefix, rest, suffix } => {
                 let total_iter = prefix.iter().chain(rest.iter()).chain(suffix.iter());
-                total_iter.map(|pat| *pat).for_each(f);
+                total_iter.copied().for_each(f);
             }
             Pat::Struct { args, .. } => {
                 args.iter().map(|f| f.pat).for_each(f);
diff --git a/crates/ra_hir/src/expr/scope.rs b/crates/ra_hir/src/expr/scope.rs
index f27cc6e8d..28fd52684 100644
--- a/crates/ra_hir/src/expr/scope.rs
+++ b/crates/ra_hir/src/expr/scope.rs
@@ -72,7 +72,7 @@ impl ExprScopes {
     }
 
     pub(crate) fn scope_for(&self, expr: ExprId) -> Option<ScopeId> {
-        self.scope_by_expr.get(&expr).map(|&scope| scope)
+        self.scope_by_expr.get(&expr).copied()
     }
 
     pub(crate) fn scope_by_expr(&self) -> &FxHashMap<ExprId, ScopeId> {
diff --git a/crates/ra_hir/src/lang_item.rs b/crates/ra_hir/src/lang_item.rs
index f9fe47b0f..0443d4d9a 100644
--- a/crates/ra_hir/src/lang_item.rs
+++ b/crates/ra_hir/src/lang_item.rs
@@ -122,7 +122,7 @@ impl LangItems {
         module: Module,
     ) {
         if let Some(module_lang_items) = db.module_lang_items(module) {
-            self.items.extend(module_lang_items.items.iter().map(|(k, v)| (k.clone(), v.clone())))
+            self.items.extend(module_lang_items.items.iter().map(|(k, v)| (k.clone(), *v)))
         }
 
         // Look for lang items in the children
@@ -142,7 +142,7 @@ impl LangItems {
     {
         let node = item.source(db).ast;
         if let Some(lang_item_name) = lang_item_name(&*node) {
-            self.items.entry(lang_item_name).or_insert(constructor(item));
+            self.items.entry(lang_item_name).or_insert_with(|| constructor(item));
         }
     }
 }
diff --git a/crates/ra_hir/src/mock.rs b/crates/ra_hir/src/mock.rs
index b26ea58c9..ba33273b8 100644
--- a/crates/ra_hir/src/mock.rs
+++ b/crates/ra_hir/src/mock.rs
@@ -76,7 +76,7 @@ impl MockDatabase {
 
     pub fn diagnostics(&self) -> String {
         let mut buf = String::from("\n");
-        let mut files: Vec<FileId> = self.files.values().map(|&it| it).collect();
+        let mut files: Vec<FileId> = self.files.values().copied().collect();
         files.sort();
         for file in files {
             let module = crate::source_binder::module_from_file_id(self, file).unwrap();
diff --git a/crates/ra_hir/src/nameres/collector.rs b/crates/ra_hir/src/nameres/collector.rs
index 2b07ebf4a..d66be34db 100644
--- a/crates/ra_hir/src/nameres/collector.rs
+++ b/crates/ra_hir/src/nameres/collector.rs
@@ -227,10 +227,8 @@ where
                             .items
                             .iter()
                             .map(|(name, res)| (name.clone(), Either::A(res.clone())));
-                        let macros = scope
-                            .macros
-                            .iter()
-                            .map(|(name, res)| (name.clone(), Either::B(res.clone())));
+                        let macros =
+                            scope.macros.iter().map(|(name, res)| (name.clone(), Either::B(*res)));
 
                         let all = items.chain(macros).collect::<Vec<_>>();
                         self.update(module_id, Some(import_id), &all);
@@ -243,10 +241,8 @@ where
                             .items
                             .iter()
                             .map(|(name, res)| (name.clone(), Either::A(res.clone())));
-                        let macros = scope
-                            .macros
-                            .iter()
-                            .map(|(name, res)| (name.clone(), Either::B(res.clone())));
+                        let macros =
+                            scope.macros.iter().map(|(name, res)| (name.clone(), Either::B(*res)));
 
                         let all = items.chain(macros).collect::<Vec<_>>();
 
@@ -651,7 +647,7 @@ fn resolve_submodule(
         candidates.push(file_dir_mod.clone());
     };
     let sr = db.source_root(source_root_id);
-    let mut points_to = candidates.into_iter().filter_map(|path| sr.files.get(&path)).map(|&it| it);
+    let mut points_to = candidates.into_iter().filter_map(|path| sr.files.get(&path)).copied();
     // FIXME: handle ambiguity
     match points_to.next() {
         Some(file_id) => Ok(file_id),
diff --git a/crates/ra_hir/src/resolve.rs b/crates/ra_hir/src/resolve.rs
index fc981e9b3..c8be27e54 100644
--- a/crates/ra_hir/src/resolve.rs
+++ b/crates/ra_hir/src/resolve.rs
@@ -272,7 +272,7 @@ impl Scope {
             },
             Scope::ImplBlockScope(i) => {
                 if name.as_known_name() == Some(KnownName::SelfType) {
-                    PerNs::types(Resolution::SelfType(i.clone()))
+                    PerNs::types(Resolution::SelfType(*i))
                 } else {
                     PerNs::none()
                 }
@@ -317,7 +317,7 @@ impl Scope {
                 }
             }
             Scope::ImplBlockScope(i) => {
-                f(Name::self_type(), PerNs::types(Resolution::SelfType(i.clone())));
+                f(Name::self_type(), PerNs::types(Resolution::SelfType(*i)));
             }
             Scope::ExprScope(e) => {
                 e.expr_scopes.entries(e.scope_id).iter().for_each(|e| {
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));
         }
     }