impl TrustedLen for vec::Drain

CAD97 · web-flow · commit f8a4b6d2ba2a · 2019-11-25T17:55:26.000-05:00
diff --git a/src/liballoc/vec.rs b/src/liballoc/vec.rs
@@ -2701,6 +2701,9 @@ impl<T> ExactSizeIterator for Drain<'_, T> {
     }
 }
 
+#[unstable(feature = "trusted_len", issue = "37572")]
+unsafe impl<T> TrustedLen for Drain<'_, T> {}
+
 #[stable(feature = "fused", since = "1.26.0")]
 impl<T> FusedIterator for Drain<'_, T> {}
 

Original file line number	Diff line number	Diff line change
`@@ -2701,6 +2701,9 @@ impl<T> ExactSizeIterator for Drain<'_, T> {`
`2701`	`2701`	`}`
`2702`	`2702`	`}`
`2703`	`2703`
	`2704`	`+#[unstable(feature = "trusted_len", issue = "37572")]`
	`2705`	`+unsafe impl<T> TrustedLen for Drain<'_, T> {}`
	`2706`	`+`
`2704`	`2707`	`#[stable(feature = "fused", since = "1.26.0")]`
`2705`	`2708`	`impl<T> FusedIterator for Drain<'_, T> {}`
`2706`	`2709`