diff --git a/src-rs/func.rs b/src-rs/func.rs
index 81f3d14d..887df372 100644
--- a/src-rs/func.rs
+++ b/src-rs/func.rs
@@ -51,7 +51,6 @@ use crate::{
 
 type MakeFuncImpl = fn(&[Arc<Value>], &mut Evaluator, &mut dyn BufMut) -> Result<()>;
 
-#[derive(PartialEq)]
 pub struct FuncInfo {
     pub name: &'static [u8],
     pub func: MakeFuncImpl,
@@ -63,6 +62,12 @@ pub struct FuncInfo {
     pub trim_right_space_1st: bool,
 }
 
+impl PartialEq for FuncInfo {
+    fn eq(&self, other: &Self) -> bool {
+        self.name == other.name
+    }
+}
+
 impl Debug for FuncInfo {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(f, "Func({})", String::from_utf8_lossy(self.name))
diff --git a/src-rs/parser.rs b/src-rs/parser.rs
index 45b7dba3..79d0f2a9 100644
--- a/src-rs/parser.rs
+++ b/src-rs/parser.rs
@@ -668,7 +668,7 @@ pub struct ParsedAssign<'a> {
     pub rhs: &'a [u8],
     pub op: AssignOp,
 }
-pub fn parse_assign_statement(line: &[u8], sep: usize) -> ParsedAssign {
+pub fn parse_assign_statement(line: &'_ [u8], sep: usize) -> ParsedAssign<'_> {
     assert!(sep != 0);
     let mut op = AssignOp::Eq;
     let mut lhs = &line[..sep];
diff --git a/src-rs/var.rs b/src-rs/var.rs
index 599928ab..d62f0e58 100644
--- a/src-rs/var.rs
+++ b/src-rs/var.rs
@@ -220,7 +220,7 @@ impl Variable {
         }
         Ok(())
     }
-    pub fn string(&self) -> Result<Cow<[u8]>> {
+    pub fn string(&'_ self) -> Result<Cow<'_, [u8]>> {
         Ok(match &self.value {
             InnerVar::Simple(s) => Cow::Borrowed(s.as_slice()),
             InnerVar::Recursive { v: _, orig } => Cow::Borrowed(orig),