diff --git a/rust/crates/yanais-core/src/egraph.rs b/rust/crates/yanais-core/src/egraph.rs
index e4d0300..591d252 100644
--- a/rust/crates/yanais-core/src/egraph.rs
+++ b/rust/crates/yanais-core/src/egraph.rs
@@ -169,14 +169,14 @@ impl Expr {
             // lambdas and their dependent types are CSR introducers
             Ek::Lambda(csr, inner) => Ek::Lambda(
                 Rc::clone(csr),
-                inner.deep_clone_intern(hmexpr, &*Self::subst_prune_csr(hsvars, csr)),
+                inner.deep_clone_intern(hmexpr, &Self::subst_prune_csr(hsvars, csr)),
             ),
 
             Ek::TyLambda { argty, arg, exp } => Ek::TyLambda {
                 // we don't need to prune the CSR from the argty because it does not bind it
                 argty: argty.deep_clone_intern(hmexpr, hsvars),
                 arg: Rc::clone(arg),
-                exp: exp.deep_clone_intern(hmexpr, &*Self::subst_prune_csr(hsvars, arg)),
+                exp: exp.deep_clone_intern(hmexpr, &Self::subst_prune_csr(hsvars, arg)),
             },
 
             Ek::Apply(lhs, rhs) => Ek::Apply(
@@ -531,7 +531,7 @@ impl Expr {
                             // we don't really care if the hsvar was already in use (which might happen when recursing)
                             // `deep_clone` filters CSRs at lambda bindings, all is well.
                             // NOTE: we implement lazy evaluation here, the lambda argument is only evaluated if needed
-                            hsvars.insert(Rc::as_ptr(&csr) as usize, rhs);
+                            hsvars.insert(Rc::as_ptr(csr) as usize, rhs);
                             // we need to subst variables because otherwise lazyness might mess stuff up
                             // (e.g. using wrong value when recursing)
 
diff --git a/rust/crates/yanais-core/src/parser/lex.rs b/rust/crates/yanais-core/src/parser/lex.rs
index f1075af..151a0ac 100644
--- a/rust/crates/yanais-core/src/parser/lex.rs
+++ b/rust/crates/yanais-core/src/parser/lex.rs
@@ -35,10 +35,10 @@ pub struct Lexer<'a, Kw> {
 }
 
 impl<Kw> Clone for Lexer<'_, Kw> {
-    #[inline]
+    #[inline(always)]
     fn clone(&self) -> Self {
         Self {
-            inner: self.inner.clone(),
+            inner: self.inner,
             _kw: PhantomData,
         }
     }
diff --git a/rust/crates/yanais-core/src/parser/mod.rs b/rust/crates/yanais-core/src/parser/mod.rs
index f81fe89..e16f7dc 100644
--- a/rust/crates/yanais-core/src/parser/mod.rs
+++ b/rust/crates/yanais-core/src/parser/mod.rs
@@ -19,6 +19,10 @@ impl EvEqSourceSpan {
     pub fn len(&self) -> usize {
         self.0.len()
     }
+    #[inline(always)]
+    pub fn is_empty(&self) -> bool {
+        self.0.len() == 0
+    }
 }
 
 impl cmp::PartialEq for EvEqSourceSpan {
diff --git a/rust/crates/yn-mrwy57u-core/src/lib.rs b/rust/crates/yn-mrwy57u-core/src/lib.rs
index 430efbb..5064d0e 100644
--- a/rust/crates/yn-mrwy57u-core/src/lib.rs
+++ b/rust/crates/yn-mrwy57u-core/src/lib.rs
@@ -115,7 +115,7 @@ impl MaybeParse<Kw> for SelIdent {
         let Token { span, kind } = none_up!(env.lxr.next())?;
 
         if let Tok::Ident(name) = kind {
-            match env.lookup(&*name) {
+            match env.lookup(&name) {
                 Some(dbidx) => Ok(Some(SelIdent { span, dbidx })),
                 None => Err(parser::Error {
                     span,
diff --git a/rust/crates/yn-qgy4hbz-core/src/typeck.rs b/rust/crates/yn-qgy4hbz-core/src/typeck.rs
index 6506970..167bc0f 100644
--- a/rust/crates/yn-qgy4hbz-core/src/typeck.rs
+++ b/rust/crates/yn-qgy4hbz-core/src/typeck.rs
@@ -410,7 +410,7 @@ impl Expr {
                     };
                     i.simplify()?;
                     kvs.push((pat.clone(), span.0.offset(), i.clone()));
-                    lam_t = (&**exp).clone();
+                    lam_t = (**exp).clone();
                     lam_t.simplify()?;
                 }
                 return Expr::LetBind {
diff --git a/rust/crates/yn-qgy4hbz-run/src/main.rs b/rust/crates/yn-qgy4hbz-run/src/main.rs
index 76323a1..13c723d 100644
--- a/rust/crates/yn-qgy4hbz-run/src/main.rs
+++ b/rust/crates/yn-qgy4hbz-run/src/main.rs
@@ -13,7 +13,7 @@ fn main() -> miette::Result<()> {
     for i in std::env::args().skip(1) {
         println!("=== {}", i);
         let fh = read_from_file(std::fs::File::open(&i)).expect("unable to open example file");
-        let code = core::str::from_utf8(&*fh).expect("unable to parse example file (UTF-8)");
+        let code = core::str::from_utf8(&fh).expect("unable to parse example file (UTF-8)");
         let mut penv = ParseEnv::new(Lexer::new(code));
         let mut expr = ync::Expr::parse(&mut penv).map_err(|e| e.with_code(&i, code))?;
         println!("{:#?}", expr);