Add the "promise" aliases to the async lang feature

yoshuawuyts · yoshuawuyts · commit 48d587491408 · 2020-12-18T16:27:09.000+01:00
diff --git a/library/std/src/keyword_docs.rs b/library/std/src/keyword_docs.rs
@@ -2175,6 +2175,7 @@ mod where_keyword {}
 
 // 2018 Edition keywords
 
+#[doc(alias = "promise")]
 #[doc(keyword = "async")]
 //
 /// Return a [`Future`] instead of blocking the current thread.
