a lot of clippy::style fixes

4 files changed, 7 insertions, 8 deletions

diff --git a/crates/mbe/src/expander/matcher.rs b/crates/mbe/src/expander/matcher.rs
index 1682b21b0..75d2f2eed 100644
--- a/crates/mbe/src/expander/matcher.rs
+++ b/crates/mbe/src/expander/matcher.rs
@@ -304,7 +304,7 @@ impl BindingsBuilder {
         link_nodes: &'a Vec<LinkNode<Rc<BindingKind>>>,
         nodes: &mut Vec<&'a Rc<BindingKind>>,
     ) {
-        link_nodes.into_iter().for_each(|it| match it {
+        link_nodes.iter().for_each(|it| match it {
             LinkNode::Node(it) => nodes.push(it),
             LinkNode::Parent { idx, len } => self.collect_nodes_ref(*idx, *len, nodes),
         });
@@ -713,10 +713,9 @@ fn match_meta_var(kind: &str, input: &mut TtIter) -> ExpandResult<Option<Fragmen
                     .map(|ident| Some(tt::Leaf::from(ident.clone()).into()))
                     .map_err(|()| err!("expected ident")),
                 "tt" => input.expect_tt().map(Some).map_err(|()| err!()),
-                "lifetime" => input
-                    .expect_lifetime()
-                    .map(|tt| Some(tt))
-                    .map_err(|()| err!("expected lifetime")),
+                "lifetime" => {
+                    input.expect_lifetime().map(Some).map_err(|()| err!("expected lifetime"))
+                }
                 "literal" => {
                     let neg = input.eat_char('-');
                     input
diff --git a/crates/mbe/src/lib.rs b/crates/mbe/src/lib.rs
index 33b85e23d..e74f8cf3f 100644
--- a/crates/mbe/src/lib.rs
+++ b/crates/mbe/src/lib.rs
@@ -356,6 +356,6 @@ impl<T> ExpandResult<T> {
 
 impl<T: Default> From<Result<T, ExpandError>> for ExpandResult<T> {
     fn from(result: Result<T, ExpandError>) -> Self {
-        result.map_or_else(|e| Self::only_err(e), |it| Self::ok(it))
+        result.map_or_else(Self::only_err, Self::ok)
     }
 }
diff --git a/crates/mbe/src/parser.rs b/crates/mbe/src/parser.rs
index c88387653..61b2a4955 100644
--- a/crates/mbe/src/parser.rs
+++ b/crates/mbe/src/parser.rs
@@ -57,7 +57,7 @@ impl<'a> Iterator for OpDelimitedIter<'a> {
 
     fn size_hint(&self) -> (usize, Option<usize>) {
         let len = self.inner.len() + if self.delimited.is_some() { 2 } else { 0 };
-        let remain = len.checked_sub(self.idx).unwrap_or(0);
+        let remain = len.saturating_sub(self.idx);
         (remain, Some(remain))
     }
 }
diff --git a/crates/mbe/src/syntax_bridge.rs b/crates/mbe/src/syntax_bridge.rs
index 8bba3d3d5..9d433b3b0 100644
--- a/crates/mbe/src/syntax_bridge.rs
+++ b/crates/mbe/src/syntax_bridge.rs
@@ -362,7 +362,7 @@ trait TokenConvertor {
             if let Some((kind, closed)) = delim {
                 let mut subtree = tt::Subtree::default();
                 let (id, idx) = self.id_alloc().open_delim(range);
-                subtree.delimiter = Some(tt::Delimiter { kind, id });
+                subtree.delimiter = Some(tt::Delimiter { id, kind });
 
                 while self.peek().map(|it| it.kind() != closed).unwrap_or(false) {
                     self.collect_leaf(&mut subtree.token_trees);