10 files changed, 29 insertions, 23 deletions

diff --git a/crates/expect/src/lib.rs b/crates/expect/src/lib.rs
index 21a458d47..bd83895f7 100644
--- a/crates/expect/src/lib.rs
+++ b/crates/expect/src/lib.rs
@@ -74,7 +74,7 @@ impl fmt::Display for Position {
 impl Expect {
     pub fn assert_eq(&self, actual: &str) {
         let trimmed = self.trimmed();
-        if &trimmed == actual {
+        if trimmed == actual {
             return;
         }
         Runtime::fail_expect(self, &trimmed, actual);
diff --git a/crates/flycheck/src/lib.rs b/crates/flycheck/src/lib.rs
index 7c38f5ef9..36e0e085a 100644
--- a/crates/flycheck/src/lib.rs
+++ b/crates/flycheck/src/lib.rs
@@ -108,7 +108,7 @@ struct FlycheckActor {
 
 enum Event {
     Restart(Restart),
-    CheckEvent(Option<cargo_metadata::Message>),
+    CheckEvent(Option<Box<cargo_metadata::Message>>),
 }
 
 impl FlycheckActor {
@@ -123,7 +123,7 @@ impl FlycheckActor {
         let check_chan = self.cargo_handle.as_ref().map(|cargo| &cargo.receiver);
         select! {
             recv(inbox) -> msg => msg.ok().map(Event::Restart),
-            recv(check_chan.unwrap_or(&never())) -> msg => Some(Event::CheckEvent(msg.ok())),
+            recv(check_chan.unwrap_or(&never())) -> msg => Some(Event::CheckEvent(msg.ok().map(Box::new))),
         }
     }
     fn run(mut self, inbox: Receiver<Restart>) {
@@ -149,7 +149,7 @@ impl FlycheckActor {
                     let res = cargo_handle.join();
                     self.send(Message::Progress(Progress::DidFinish(res)));
                 }
-                Event::CheckEvent(Some(message)) => match message {
+                Event::CheckEvent(Some(message)) => match *message {
                     cargo_metadata::Message::CompilerArtifact(msg) => {
                         self.send(Message::Progress(Progress::DidCheckCrate(msg.target.name)));
                     }
diff --git a/crates/ra_arena/src/map.rs b/crates/ra_arena/src/map.rs
index 0f33907c0..c1b58712c 100644
--- a/crates/ra_arena/src/map.rs
+++ b/crates/ra_arena/src/map.rs
@@ -13,18 +13,18 @@ pub struct ArenaMap<ID, V> {
 
 impl<T, V> ArenaMap<Idx<T>, V> {
     pub fn insert(&mut self, id: Idx<T>, t: V) {
-        let idx = Self::to_idx(id);
+        let idx = Self::into_idx(id);
 
         self.v.resize_with((idx + 1).max(self.v.len()), || None);
         self.v[idx] = Some(t);
     }
 
     pub fn get(&self, id: Idx<T>) -> Option<&V> {
-        self.v.get(Self::to_idx(id)).and_then(|it| it.as_ref())
+        self.v.get(Self::into_idx(id)).and_then(|it| it.as_ref())
     }
 
     pub fn get_mut(&mut self, id: Idx<T>) -> Option<&mut V> {
-        self.v.get_mut(Self::to_idx(id)).and_then(|it| it.as_mut())
+        self.v.get_mut(Self::into_idx(id)).and_then(|it| it.as_mut())
     }
 
     pub fn values(&self) -> impl Iterator<Item = &V> {
@@ -39,7 +39,7 @@ impl<T, V> ArenaMap<Idx<T>, V> {
         self.v.iter().enumerate().filter_map(|(idx, o)| Some((Self::from_idx(idx), o.as_ref()?)))
     }
 
-    fn to_idx(id: Idx<T>) -> usize {
+    fn into_idx(id: Idx<T>) -> usize {
         u32::from(id.into_raw()) as usize
     }
 
@@ -51,7 +51,7 @@ impl<T, V> ArenaMap<Idx<T>, V> {
 impl<T, V> std::ops::Index<Idx<V>> for ArenaMap<Idx<V>, T> {
     type Output = T;
     fn index(&self, id: Idx<V>) -> &T {
-        self.v[Self::to_idx(id)].as_ref().unwrap()
+        self.v[Self::into_idx(id)].as_ref().unwrap()
     }
 }
 
diff --git a/crates/ra_mbe/src/mbe_expander/matcher.rs b/crates/ra_mbe/src/mbe_expander/matcher.rs
index f9e515b81..933a3a3b5 100644
--- a/crates/ra_mbe/src/mbe_expander/matcher.rs
+++ b/crates/ra_mbe/src/mbe_expander/matcher.rs
@@ -276,7 +276,7 @@ impl<'a> TtIter<'a> {
         Ok(tt::Subtree {
             delimiter: None,
             token_trees: vec![
-                tt::Leaf::Punct(punct.clone()).into(),
+                tt::Leaf::Punct(*punct).into(),
                 tt::Leaf::Ident(ident.clone()).into(),
             ],
         }
diff --git a/crates/ra_parser/src/grammar/expressions/atom.rs b/crates/ra_parser/src/grammar/expressions/atom.rs
index 0b01d3bc6..ca6569c9f 100644
--- a/crates/ra_parser/src/grammar/expressions/atom.rs
+++ b/crates/ra_parser/src/grammar/expressions/atom.rs
@@ -243,12 +243,10 @@ fn lambda_expr(p: &mut Parser) -> CompletedMarker {
         // test lambda_ret_block
         // fn main() { || -> i32 { 92 }(); }
         block_expr(p);
+    } else if p.at_ts(EXPR_FIRST) {
+        expr(p);
     } else {
-        if p.at_ts(EXPR_FIRST) {
-            expr(p);
-        } else {
-            p.error("expected expression");
-        }
+        p.error("expected expression");
     }
     m.complete(p, CLOSURE_EXPR)
 }
diff --git a/crates/ra_proc_macro/src/process.rs b/crates/ra_proc_macro/src/process.rs
index 5bcdacb48..37dd3f496 100644
--- a/crates/ra_proc_macro/src/process.rs
+++ b/crates/ra_proc_macro/src/process.rs
@@ -90,7 +90,7 @@ impl ProcMacroProcessSrv {
             }
             Some(it) => it,
         };
-        sender.send(Task { req: req.into(), result_tx }).unwrap();
+        sender.send(Task { req, result_tx }).unwrap();
         let res = result_rx
             .recv()
             .map_err(|_| ra_tt::ExpansionError::Unknown("Proc macro thread is closed.".into()))?;
diff --git a/crates/ra_text_edit/src/lib.rs b/crates/ra_text_edit/src/lib.rs
index 25554f583..d68791cf1 100644
--- a/crates/ra_text_edit/src/lib.rs
+++ b/crates/ra_text_edit/src/lib.rs
@@ -76,10 +76,6 @@ impl TextEdit {
         self.indels.iter()
     }
 
-    pub fn into_iter(self) -> vec::IntoIter<Indel> {
-        self.indels.into_iter()
-    }
-
     pub fn apply(&self, text: &mut String) {
         match self.len() {
             0 => return,
@@ -141,6 +137,15 @@ impl TextEdit {
     }
 }
 
+impl IntoIterator for TextEdit {
+    type Item = Indel;
+    type IntoIter = vec::IntoIter<Self::Item>;
+
+    fn into_iter(self) -> Self::IntoIter {
+        self.indels.into_iter()
+    }
+}
+
 impl TextEditBuilder {
     pub fn replace(&mut self, range: TextRange, replace_with: String) {
         self.indels.push(Indel::replace(range, replace_with))
diff --git a/crates/ra_tt/src/lib.rs b/crates/ra_tt/src/lib.rs
index 8faf1cc67..20c3f5eab 100644
--- a/crates/ra_tt/src/lib.rs
+++ b/crates/ra_tt/src/lib.rs
@@ -107,7 +107,7 @@ fn print_debug_subtree(f: &mut fmt::Formatter<'_>, subtree: &Subtree, level: usi
         for (idx, child) in subtree.token_trees.iter().enumerate() {
             print_debug_token(f, child, level + 1)?;
             if idx != subtree.token_trees.len() - 1 {
-                writeln!(f, "")?;
+                writeln!(f)?;
             }
         }
     }
diff --git a/crates/stdx/src/lib.rs b/crates/stdx/src/lib.rs
index b65875c96..00bfcd29e 100644
--- a/crates/stdx/src/lib.rs
+++ b/crates/stdx/src/lib.rs
@@ -10,7 +10,7 @@ pub fn is_ci() -> bool {
 
 pub trait SepBy: Sized {
     /// Returns an `impl fmt::Display`, which joins elements via a separator.
-    fn sep_by<'a>(self, sep: &'a str) -> SepByBuilder<'a, Self>;
+    fn sep_by(self, sep: &str) -> SepByBuilder<'_, Self>;
 }
 
 impl<I> SepBy for I
@@ -18,7 +18,7 @@ where
     I: Iterator,
     I::Item: fmt::Display,
 {
-    fn sep_by<'a>(self, sep: &'a str) -> SepByBuilder<'a, Self> {
+    fn sep_by(self, sep: &str) -> SepByBuilder<'_, Self> {
         SepByBuilder::new(sep, self)
     }
 }
diff --git a/crates/vfs/src/file_set.rs b/crates/vfs/src/file_set.rs
index e9196fcd2..9f11268ee 100644
--- a/crates/vfs/src/file_set.rs
+++ b/crates/vfs/src/file_set.rs
@@ -19,6 +19,9 @@ impl FileSet {
     pub fn len(&self) -> usize {
         self.files.len()
     }
+    pub fn is_empty(&self) -> bool {
+        self.len() == 0
+    }
     pub fn resolve_path(&self, anchor: FileId, path: &str) -> Option<FileId> {
         let mut base = self.paths[&anchor].clone();
         base.pop();