4 files changed, 14 insertions, 9 deletions

diff --git a/crates/ra_hir/src/lang_item.rs b/crates/ra_hir/src/lang_item.rs
index 4cacaeba4..684fbc068 100644
--- a/crates/ra_hir/src/lang_item.rs
+++ b/crates/ra_hir/src/lang_item.rs
@@ -95,7 +95,7 @@ impl LangItems {
                 .nth(0);
             if let Some(lang_item_name) = lang_item_name {
                 let imp = ImplBlock::from_id(*module, impl_id);
-                self.items.entry(lang_item_name).or_insert(LangItemTarget::ImplBlock(imp));
+                self.items.entry(lang_item_name).or_insert_with(|| LangItemTarget::ImplBlock(imp));
             }
         }
 
diff --git a/crates/ra_hir/src/nameres.rs b/crates/ra_hir/src/nameres.rs
index d822f7d93..7bddee9b9 100644
--- a/crates/ra_hir/src/nameres.rs
+++ b/crates/ra_hir/src/nameres.rs
@@ -332,7 +332,8 @@ impl CrateDefMap {
         let name = path.expand_macro_expr()?;
         // search local first
         // FIXME: Remove public_macros check when we have a correct local_macors implementation
-        let local = self.public_macros.get(&name).or(self.local_macros.get(&name)).map(|it| *it);
+        let local =
+            self.public_macros.get(&name).or_else(|| self.local_macros.get(&name)).map(|it| *it);
         if local.is_some() {
             return local;
         }
@@ -479,8 +480,10 @@ impl CrateDefMap {
     }
 
     fn resolve_name_in_crate_root_or_extern_prelude(&self, name: &Name) -> ItemOrMacro {
-        let from_crate_root =
-            self[self.root].scope.get_item_or_macro(name).unwrap_or(Either::Left(PerNs::none()));
+        let from_crate_root = self[self.root]
+            .scope
+            .get_item_or_macro(name)
+            .unwrap_or_else(|| Either::Left(PerNs::none()));
         let from_extern_prelude = self.resolve_name_in_extern_prelude(name);
 
         or(from_crate_root, Either::Left(from_extern_prelude))
@@ -505,8 +508,10 @@ impl CrateDefMap {
         //  - current module / scope
         //  - extern prelude
         //  - std prelude
-        let from_scope =
-            self[module].scope.get_item_or_macro(name).unwrap_or(Either::Left(PerNs::none()));;
+        let from_scope = self[module]
+            .scope
+            .get_item_or_macro(name)
+            .unwrap_or_else(|| Either::Left(PerNs::none()));;
         let from_extern_prelude =
             self.extern_prelude.get(name).map_or(PerNs::none(), |&it| PerNs::types(it));
         let from_prelude = self.resolve_in_prelude(db, name);
@@ -525,7 +530,7 @@ impl CrateDefMap {
             } else {
                 db.crate_def_map(prelude.krate)[prelude.module_id].scope.get_item_or_macro(name)
             };
-            resolution.unwrap_or(Either::Left(PerNs::none()))
+            resolution.unwrap_or_else(|| Either::Left(PerNs::none()))
         } else {
             Either::Left(PerNs::none())
         }
diff --git a/crates/ra_hir/src/ty.rs b/crates/ra_hir/src/ty.rs
index 76d34c12b..4a37e0268 100644
--- a/crates/ra_hir/src/ty.rs
+++ b/crates/ra_hir/src/ty.rs
@@ -451,7 +451,7 @@ impl Ty {
     /// Substitutes `Ty::Bound` vars (as opposed to type parameters).
     pub fn subst_bound_vars(self, substs: &Substs) -> Ty {
         self.fold(&mut |ty| match ty {
-            Ty::Bound(idx) => substs.get(idx as usize).cloned().unwrap_or(Ty::Bound(idx)),
+            Ty::Bound(idx) => substs.get(idx as usize).cloned().unwrap_or_else(|| Ty::Bound(idx)),
             ty => ty,
         })
     }
diff --git a/crates/ra_hir/src/ty/infer.rs b/crates/ra_hir/src/ty/infer.rs
index 5edc59f18..905fe9f0e 100644
--- a/crates/ra_hir/src/ty/infer.rs
+++ b/crates/ra_hir/src/ty/infer.rs
@@ -462,7 +462,7 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
         let mut resolved =
             if remaining_index.is_none() { def.take_values()? } else { def.take_types()? };
 
-        let remaining_index = remaining_index.unwrap_or(path.segments.len());
+        let remaining_index = remaining_index.unwrap_or_else(|| path.segments.len());
         let mut actual_def_ty: Option<Ty> = None;
 
         let krate = resolver.krate()?;