diff --git a/benches/bench_set.rs b/benches/bench_set.rs
index d59e3e57..58abc956 100644
--- a/benches/bench_set.rs
+++ b/benches/bench_set.rs
@@ -9,7 +9,7 @@ fn set_new(b: &mut Bencher<'_>) {
         const LEN: usize = 100_000;
         // Create Python objects up-front, so that the benchmark doesn't need to include
         // the cost of allocating LEN Python integers
-        let elements: Vec<PyObject> = (0..LEN).into_iter().map(|i| i.into_py(py)).collect();
+        let elements: Vec<PyObject> = (0..LEN).map(|i| i.into_py(py)).collect();
         b.iter(|| {
             let pool = unsafe { py.new_pool() };
             PySet::new(py, &elements).unwrap();
diff --git a/pyo3-macros-backend/src/frompyobject.rs b/pyo3-macros-backend/src/frompyobject.rs
index ba365efe..831aed25 100644
--- a/pyo3-macros-backend/src/frompyobject.rs
+++ b/pyo3-macros-backend/src/frompyobject.rs
@@ -278,7 +278,6 @@ impl<'a> Container<'a> {
         let self_ty = &self.path;
         let struct_name = &self.name();
         let field_idents: Vec<_> = (0..struct_fields.len())
-            .into_iter()
             .map(|i| format_ident!("arg{}", i))
             .collect();
         let fields = struct_fields.iter().zip(&field_idents).enumerate().map(|(index, (field, ident))| {
diff --git a/pyo3-macros-backend/src/pymethod.rs b/pyo3-macros-backend/src/pymethod.rs
index fa81c6d4..3807a1fd 100644
--- a/pyo3-macros-backend/src/pymethod.rs
+++ b/pyo3-macros-backend/src/pymethod.rs
@@ -1109,7 +1109,6 @@ impl SlotDef {
         let py = syn::Ident::new("_py", Span::call_site());
         let arg_types: &Vec<_> = &arguments.iter().map(|arg| arg.ffi_type()).collect();
         let arg_idents: &Vec<_> = &(0..arguments.len())
-            .into_iter()
             .map(|i| format_ident!("arg{}", i))
             .collect();
         let wrapper_ident = format_ident!("__pymethod_{}__", method_name);
@@ -1220,7 +1219,6 @@ impl SlotFragmentDef {
         let py = syn::Ident::new("_py", Span::call_site());
         let arg_types: &Vec<_> = &arguments.iter().map(|arg| arg.ffi_type()).collect();
         let arg_idents: &Vec<_> = &(0..arguments.len())
-            .into_iter()
             .map(|i| format_ident!("arg{}", i))
             .collect();
         let body = generate_method_body(cls, spec, &py, arguments, *extract_error_mode, None)?;