Fill tracking issue for iter_map_while feature

Author: WaffleLapkin

src/libcore/iter/adapters/mod.rs

@@ -1760,7 +1760,7 @@ where
 /// [`map_while`]: trait.Iterator.html#method.map_while
 /// [`Iterator`]: trait.Iterator.html
 #[must_use = "iterators are lazy and do nothing unless consumed"]
-#[unstable(feature = "iter_map_while", reason = "recently added", issue = "none")]
+#[unstable(feature = "iter_map_while", reason = "recently added", issue = "68537")]
 #[derive(Clone)]
 pub struct MapWhile<I, P> {
     iter: I,
@@ -1774,14 +1774,14 @@ impl<I, P> MapWhile<I, P> {
     }
 }
 
-#[unstable(feature = "iter_map_while", reason = "recently added", issue = "none")]
+#[unstable(feature = "iter_map_while", reason = "recently added", issue = "68537")]
 impl<I: fmt::Debug, P> fmt::Debug for MapWhile<I, P> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_struct("MapWhile").field("iter", &self.iter).field("flag", &self.finished).finish()
     }
 }
 
-#[unstable(feature = "iter_map_while", reason = "recently added", issue = "none")]
+#[unstable(feature = "iter_map_while", reason = "recently added", issue = "68537")]
 impl<B, I: Iterator, P> Iterator for MapWhile<I, P>
 where
     P: FnMut(I::Item) -> Option<B>,

src/libcore/iter/mod.rs

@@ -351,7 +351,7 @@ pub use self::adapters::Cloned;
 pub use self::adapters::Copied;
 #[stable(feature = "iterator_flatten", since = "1.29.0")]
 pub use self::adapters::Flatten;
-#[unstable(feature = "iter_map_while", reason = "recently added", issue = "none")]
+#[unstable(feature = "iter_map_while", reason = "recently added", issue = "68537")]
 pub use self::adapters::MapWhile;
 #[stable(feature = "iterator_step_by", since = "1.28.0")]
 pub use self::adapters::StepBy;

src/libcore/iter/traits/iterator.rs

@@ -1117,7 +1117,7 @@ pub trait Iterator {
     /// [`Some`]: ../../std/option/enum.Option.html#variant.Some
     /// [`None`]: ../../std/option/enum.Option.html#variant.None
     #[inline]
-    #[unstable(feature = "iter_map_while", reason = "recently added", issue = "none")]
+    #[unstable(feature = "iter_map_while", reason = "recently added", issue = "68537")]
     fn map_while<B, P>(self, predicate: P) -> MapWhile<Self, P>
     where
         Self: Sized,