[Clippy] Swap manual_retain to use diagnostic items instead of paths

Author: GnomedDev

alloc/src/collections/binary_heap/mod.rs

@@ -959,6 +959,7 @@ impl<T, A: Allocator> BinaryHeap<T, A> {
     /// }
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "binaryheap_iter")]
     pub fn iter(&self) -> Iter<'_, T> {
         Iter { iter: self.data.iter() }
     }

alloc/src/collections/btree/set.rs

@@ -1132,6 +1132,7 @@ impl<T, A: Allocator + Clone> BTreeSet<T, A> {
     /// assert_eq!(set_iter.next(), None);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "btreeset_iter")]
     pub fn iter(&self) -> Iter<'_, T> {
         Iter { iter: self.map.keys() }
     }

alloc/src/collections/vec_deque/mod.rs

@@ -1201,6 +1201,7 @@ impl<T, A: Allocator> VecDeque<T, A> {
     /// assert_eq!(&c[..], b);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "vecdeque_iter")]
     pub fn iter(&self) -> Iter<'_, T> {
         let (a, b) = self.as_slices();
         Iter::new(a.iter(), b.iter())

core/src/iter/traits/iterator.rs

@@ -876,6 +876,7 @@ pub trait Iterator {
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_do_not_const_check]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "iter_filter")]
     fn filter<P>(self, predicate: P) -> Filter<Self, P>
     where
         Self: Sized,
@@ -3412,6 +3413,7 @@ pub trait Iterator {
     /// ```
     #[stable(feature = "iter_copied", since = "1.36.0")]
     #[rustc_do_not_const_check]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "iter_copied")]
     fn copied<'a, T: 'a>(self) -> Copied<Self>
     where
         Self: Sized + Iterator<Item = &'a T>,
@@ -3460,6 +3462,7 @@ pub trait Iterator {
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_do_not_const_check]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "iter_cloned")]
     fn cloned<'a, T: 'a>(self) -> Cloned<Self>
     where
         Self: Sized + Iterator<Item = &'a T>,

core/src/slice/mod.rs

@@ -1010,6 +1010,7 @@ impl<T> [T] {
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     #[inline]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "slice_iter")]
     pub fn iter(&self) -> Iter<'_, T> {
         Iter::new(self)
     }

core/src/str/mod.rs

@@ -832,6 +832,7 @@ impl str {
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     #[inline]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "str_chars")]
     pub fn chars(&self) -> Chars<'_> {
         Chars { iter: self.as_bytes().iter() }
     }

std/src/collections/hash/set.rs

@@ -187,6 +187,7 @@ impl<T, S> HashSet<T, S> {
     #[inline]
     #[rustc_lint_query_instability]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "hashset_iter")]
     pub fn iter(&self) -> Iter<'_, T> {
         Iter { base: self.base.iter() }
     }