WIP: use in double_ended_iterator_last

the unfixable warning is now fixable, but that's kind of a problem
because the `_unfixable` file doesn't have any error patterns left,
which uitest complains about

Author: ada4a

clippy_lints/src/methods/double_ended_iterator_last.rs

@@ -1,6 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::ty::{has_non_owning_mutable_access, implements_trait};
-use clippy_utils::{is_mutable, is_trait_method, path_to_local, sym};
+use clippy_utils::{is_mutable, is_trait_method, path_to_local_with_projections, sym};
 use rustc_errors::Applicability;
 use rustc_hir::{Expr, Node, PatKind};
 use rustc_lint::LateContext;
@@ -37,7 +37,7 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &'_ Expr<'_>, self_expr: &'_ Exp
         // TODO: Change this to lint only when the referred iterator is not used later. If it is used later,
         // changing to `next_back()` may change its behavior.
         if !(is_mutable(cx, self_expr) || self_type.is_ref()) {
-            if let Some(hir_id) = path_to_local(self_expr)
+            if let Some(hir_id) = path_to_local_with_projections(self_expr)
                 && let Node::Pat(pat) = cx.tcx.hir_node(hir_id)
                 && let PatKind::Binding(_, _, ident, _) = pat.kind
             {

tests/ui/double_ended_iterator_last.fixed

@@ -108,6 +108,12 @@ fn drop_order() {
     let mut v = DropDeIterator(v.into_iter());
     println!("Last element is {}", v.next_back().unwrap().0);
     //~^ ERROR: called `Iterator::last` on a `DoubleEndedIterator`
+
+    let v = vec![S("one"), S("two"), S("three")];
+    let mut v = (DropDeIterator(v.into_iter()), 42);
+    println!("Last element is {}", v.0.next_back().unwrap().0);
+    //~^ ERROR: called `Iterator::last` on a `DoubleEndedIterator`
+
     println!("Done");
 }
 

tests/ui/double_ended_iterator_last.rs

@@ -108,6 +108,12 @@ fn drop_order() {
     let v = DropDeIterator(v.into_iter());
     println!("Last element is {}", v.last().unwrap().0);
     //~^ ERROR: called `Iterator::last` on a `DoubleEndedIterator`
+
+    let v = vec![S("one"), S("two"), S("three")];
+    let v = (DropDeIterator(v.into_iter()), 42);
+    println!("Last element is {}", v.0.last().unwrap().0);
+    //~^ ERROR: called `Iterator::last` on a `DoubleEndedIterator`
+
     println!("Done");
 }
 

tests/ui/double_ended_iterator_last.stderr

@@ -30,5 +30,18 @@ LL ~     let mut v = DropDeIterator(v.into_iter());
 LL ~     println!("Last element is {}", v.next_back().unwrap().0);
    |
 
-error: aborting due to 3 previous errors
+error: called `Iterator::last` on a `DoubleEndedIterator`; this will needlessly iterate the entire iterator
+  --> tests/ui/double_ended_iterator_last.rs:114:36
+   |
+LL |     println!("Last element is {}", v.0.last().unwrap().0);
+   |                                    ^^^^^^^^^^
+   |
+   = note: this change will alter drop order which may be undesirable
+help: try
+   |
+LL ~     let mut v = (DropDeIterator(v.into_iter()), 42);
+LL ~     println!("Last element is {}", v.0.next_back().unwrap().0);
+   |
+
+error: aborting due to 4 previous errors
 

tests/ui/double_ended_iterator_last_unfixable.rs

@@ -9,31 +9,3 @@ fn main() {
     let _ = subindex.0.last();
     let _ = index.next();
 }
-
-fn drop_order() {
-    struct DropDeIterator(std::vec::IntoIter<S>);
-    impl Iterator for DropDeIterator {
-        type Item = S;
-        fn next(&mut self) -> Option<Self::Item> {
-            self.0.next()
-        }
-    }
-    impl DoubleEndedIterator for DropDeIterator {
-        fn next_back(&mut self) -> Option<Self::Item> {
-            self.0.next_back()
-        }
-    }
-
-    struct S(&'static str);
-    impl std::ops::Drop for S {
-        fn drop(&mut self) {
-            println!("Dropping {}", self.0);
-        }
-    }
-
-    let v = vec![S("one"), S("two"), S("three")];
-    let v = (DropDeIterator(v.into_iter()), 42);
-    println!("Last element is {}", v.0.last().unwrap().0);
-    //~^ ERROR: called `Iterator::last` on a `DoubleEndedIterator`
-    println!("Done");
-}