move the other "unfixable" case as well

it shouldn't lint anyway, so having it in the main test file is fine

Author: ada4a

tests/ui/double_ended_iterator_last.fixed

@@ -81,6 +81,11 @@ fn issue_14139() {
     let (subindex, _) = (index.by_ref().take(3), 42);
     let _ = subindex.last();
     let _ = index.next();
+
+    let mut index = [true, true, false, false, false, true].iter();
+    let subindex = (index.by_ref().take(3), 42);
+    let _ = subindex.0.last();
+    let _ = index.next();
 }
 
 fn drop_order() {

tests/ui/double_ended_iterator_last.rs

@@ -81,6 +81,11 @@ fn issue_14139() {
     let (subindex, _) = (index.by_ref().take(3), 42);
     let _ = subindex.last();
     let _ = index.next();
+
+    let mut index = [true, true, false, false, false, true].iter();
+    let subindex = (index.by_ref().take(3), 42);
+    let _ = subindex.0.last();
+    let _ = index.next();
 }
 
 fn drop_order() {

tests/ui/double_ended_iterator_last.stderr

@@ -18,7 +18,7 @@ LL |     let _ = DeIterator.last();
    |                        help: try: `next_back()`
 
 error: called `Iterator::last` on a `DoubleEndedIterator`; this will needlessly iterate the entire iterator
-  --> tests/ui/double_ended_iterator_last.rs:109:36
+  --> tests/ui/double_ended_iterator_last.rs:114:36
    |
 LL |     println!("Last element is {}", v.last().unwrap().0);
    |                                    ^^^^^^^^
@@ -31,7 +31,7 @@ LL ~     println!("Last element is {}", v.next_back().unwrap().0);
    |
 
 error: called `Iterator::last` on a `DoubleEndedIterator`; this will needlessly iterate the entire iterator
-  --> tests/ui/double_ended_iterator_last.rs:114:36
+  --> tests/ui/double_ended_iterator_last.rs:119:36
    |
 LL |     println!("Last element is {}", v.0.last().unwrap().0);
    |                                    ^^^^^^^^^^