Rollup merge of rust-lang#49049 - Centril:fix/flatten-fusediterator, r=bluss

kennytm · kennytm · commit fb49ae026052 · 2018-03-16T05:38:29.000+08:00
Unstabilize FusedIterator for Flatten since Flatten is unstable PR rust-lang#47463 made `impl<I, U> FusedIterator for Flatten<I>` stable but shouldn't have since `Flatten` is still unstable. This PR makes the impl unstable again.
diff --git a/src/libcore/iter/mod.rs b/src/libcore/iter/mod.rs
@@ -2605,7 +2605,7 @@ impl<I, U> DoubleEndedIterator for Flatten<I>
     }
 }
 
-#[stable(feature = "fused", since = "1.26.0")]
+#[unstable(feature = "iterator_flatten", issue = "48213")]
 impl<I, U> FusedIterator for Flatten<I>
     where I: FusedIterator, U: Iterator,
           I::Item: IntoIterator<IntoIter = U, Item = U::Item> {}

Original file line number	Diff line number	Diff line change
`@@ -2605,7 +2605,7 @@ impl<I, U> DoubleEndedIterator for Flatten<I>`
`2605`	`2605`	`}`
`2606`	`2606`	`}`
`2607`	`2607`
`2608`		`-#[stable(feature = "fused", since = "1.26.0")]`
	`2608`	`+#[unstable(feature = "iterator_flatten", issue = "48213")]`
`2609`	`2609`	`impl<I, U> FusedIterator for Flatten<I>`
`2610`	`2610`	`where I: FusedIterator, U: Iterator,`
`2611`	`2611`	`I::Item: IntoIterator<IntoIter = U, Item = U::Item> {}`