avoid converting types into themselves via .into() (clippy::useless-conversion)

example: let x: String = String::from("hello world").into();

4 files changed, 12 insertions, 14 deletions

diff --git a/crates/mbe/src/benchmark.rs b/crates/mbe/src/benchmark.rs
index 503ad1355..bd8ea6452 100644
--- a/crates/mbe/src/benchmark.rs
+++ b/crates/mbe/src/benchmark.rs
@@ -120,7 +120,7 @@ fn invocation_fixtures(rules: &FxHashMap<String, MacroRules>) -> Vec<(String, tt
                 Some("pat") => parent.token_trees.push(make_ident("foo")),
                 Some("path") => parent.token_trees.push(make_ident("foo")),
                 Some("literal") => parent.token_trees.push(make_literal("1")),
-                Some("expr") => parent.token_trees.push(make_ident("foo").into()),
+                Some("expr") => parent.token_trees.push(make_ident("foo")),
                 Some("lifetime") => {
                     parent.token_trees.push(make_punct('\''));
                     parent.token_trees.push(make_ident("a"));
@@ -157,17 +157,15 @@ fn invocation_fixtures(rules: &FxHashMap<String, MacroRules>) -> Vec<(String, tt
                     if i + 1 != cnt {
                         if let Some(sep) = separator {
                             match sep {
-                                Separator::Literal(it) => parent
-                                    .token_trees
-                                    .push(tt::Leaf::Literal(it.clone().into()).into()),
-                                Separator::Ident(it) => parent
-                                    .token_trees
-                                    .push(tt::Leaf::Ident(it.clone().into()).into()),
+                                Separator::Literal(it) => {
+                                    parent.token_trees.push(tt::Leaf::Literal(it.clone()).into())
+                                }
+                                Separator::Ident(it) => {
+                                    parent.token_trees.push(tt::Leaf::Ident(it.clone()).into())
+                                }
                                 Separator::Puncts(puncts) => {
                                     for it in puncts {
-                                        parent
-                                            .token_trees
-                                            .push(tt::Leaf::Punct(it.clone().into()).into())
+                                        parent.token_trees.push(tt::Leaf::Punct(it.clone()).into())
                                     }
                                 }
                             };
diff --git a/crates/mbe/src/expander/matcher.rs b/crates/mbe/src/expander/matcher.rs
index 2c69e8968..1bf7c2e81 100644
--- a/crates/mbe/src/expander/matcher.rs
+++ b/crates/mbe/src/expander/matcher.rs
@@ -722,7 +722,7 @@ fn match_meta_var(kind: &str, input: &mut TtIter) -> ExpandResult<Option<Fragmen
                     input
                         .expect_literal()
                         .map(|literal| {
-                            let lit = tt::Leaf::from(literal.clone());
+                            let lit = literal.clone();
                             match neg {
                                 None => Some(lit.into()),
                                 Some(neg) => Some(tt::TokenTree::Subtree(tt::Subtree {
diff --git a/crates/mbe/src/syntax_bridge.rs b/crates/mbe/src/syntax_bridge.rs
index b715ebfc4..85163c4b3 100644
--- a/crates/mbe/src/syntax_bridge.rs
+++ b/crates/mbe/src/syntax_bridge.rs
@@ -130,7 +130,7 @@ pub fn parse_exprs_with_sep(tt: &tt::Subtree, sep: char) -> Vec<tt::Subtree> {
         res.push(match expanded.value {
             None => break,
             Some(tt @ tt::TokenTree::Leaf(_)) => {
-                tt::Subtree { delimiter: None, token_trees: vec![tt.into()] }
+                tt::Subtree { delimiter: None, token_trees: vec![tt] }
             }
             Some(tt::TokenTree::Subtree(tt)) => tt,
         });
@@ -727,7 +727,7 @@ impl<'a> TreeSink for TtTreeSink<'a> {
             // Note: We always assume the semi-colon would be the last token in
             // other parts of RA such that we don't add whitespace here.
             if curr.spacing == tt::Spacing::Alone && curr.char != ';' {
-                self.inner.token(WHITESPACE, " ".into());
+                self.inner.token(WHITESPACE, " ");
                 self.text_pos += TextSize::of(' ');
             }
         }
diff --git a/crates/mbe/src/tests.rs b/crates/mbe/src/tests.rs
index eca0bcc18..25c374b9b 100644
--- a/crates/mbe/src/tests.rs
+++ b/crates/mbe/src/tests.rs
@@ -35,7 +35,7 @@ mod rule_parsing {
     fn test_invalid_arms() {
         fn check(macro_body: &str, err: ParseError) {
             let m = parse_macro_arm(macro_body);
-            assert_eq!(m, Err(err.into()));
+            assert_eq!(m, Err(err));
         }
         check("invalid", ParseError::Expected("expected subtree".into()));