2 files changed, 10 insertions, 1 deletions
diff --git a/src/libstd/backtrace.rs b/src/libstd/backtrace.rs
index a1c9aa75d77..97db0ff3791 100644
--- a/src/libstd/backtrace.rs
+++ b/src/libstd/backtrace.rs
@@ -304,7 +304,7 @@ impl Backtrace {
         // If no frames came out assume that this is an unsupported platform
         // since `backtrace` doesn't provide a way of learning this right now,
         // and this should be a good enough approximation.
-        let inner = if frames.len() == 0 {
+        let inner = if frames.is_empty() {
             Inner::Unsupported
         } else {
             Inner::Captured(Mutex::new(Capture {
diff --git a/src/libstd/keyword_docs.rs b/src/libstd/keyword_docs.rs
index 58f4e76cd30..3c69c1160d5 100644
--- a/src/libstd/keyword_docs.rs
+++ b/src/libstd/keyword_docs.rs
@@ -895,6 +895,15 @@ mod mod_keyword {}
 /// // x is no longer available
 /// ```
 ///
+/// `move` is also valid before an async block.
+///
+/// ```rust
+/// let capture = "hello";
+/// let block = async move {
+///     println!("rust says {} from async block", capture);
+/// };
+/// ```
+///
 /// For more information on the `move` keyword, see the [closure]'s section
 /// of the Rust book or the [threads] section
 ///