Dogfood double_ended_iterator_last

clippy_lints/src/attrs/mixed_attributes_style.rs

@@ -66,7 +66,7 @@ pub(super) fn check(cx: &EarlyContext<'_>, item_span: Span, attrs: &[Attribute])
 
 fn lint_mixed_attrs(cx: &EarlyContext<'_>, attrs: &[Attribute]) {
     let mut attrs_iter = attrs.iter().filter(|attr| !attr.span.from_expansion());
-    let span = if let (Some(first), Some(last)) = (attrs_iter.next(), attrs_iter.last()) {
+    let span = if let (Some(first), Some(last)) = (attrs_iter.next(), attrs_iter.next_back()) {
         first.span.with_hi(last.span.hi())
     } else {
         return;

clippy_lints/src/methods/double_ended_iterator_last.rs

@@ -24,7 +24,7 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &'_ Expr<'_>, self_expr: &'_ Exp
         && let Ok(Some(fn_def)) = Instance::try_resolve(cx.tcx, cx.typing_env(), id, args)
         // find the provided definition of Iterator::last
         && let Some(item) = cx.tcx.get_diagnostic_item(sym::Iterator)
-        && let Some(last_def) = cx.tcx.provided_trait_methods(item).find(|m| m.name == sym!(last))
+        && let Some(last_def) = cx.tcx.provided_trait_methods(item).find(|m| m.name.as_str() == "last")
         // if the resolved method is the same as the provided definition
         && fn_def.def_id() == last_def.def_id
     {

clippy_utils/src/msrvs.rs

@@ -130,7 +130,7 @@ impl Msrv {
         let mut msrv_attrs = attrs.iter().filter(|attr| attr.path_matches(&[sym::clippy, sym_msrv]));
 
         if let Some(msrv_attr) = msrv_attrs.next() {
-            if let Some(duplicate) = msrv_attrs.last() {
+            if let Some(duplicate) = msrv_attrs.next_back() {
                 sess.dcx()
                     .struct_span_err(duplicate.span(), "`clippy::msrv` is defined multiple times")
                     .with_span_note(msrv_attr.span(), "first definition found here")