Highlight Rust async and await as keywords

CHANGELOG.md

@@ -66,6 +66,7 @@
 
 ## Syntaxes
 
+- Highlight Rust `async` and `await` as keywords, see #3849 (@coyaSONG)
 - Add shebang-based detection for Tcl (`tclsh`, `wish`) and Expect (`expect`) scripts, see #3647 (@mvanhorn)
 - Change the URL of Zig submodule from GitHub to Codeberg, see #3519 (@sorairolake)
 - Don't color strings inside CSV files, to make it easier to tell which column they belong to, see #3521 (@keith-hall)

assets/patches/Rust.sublime-syntax.patch

@@ -2,6 +2,9 @@ diff --git syntaxes/01_Packages/Rust/Rust.sublime-syntax syntaxes/01_Packages/Ru
 index 3c354486..24727a4e 100644
 --- syntaxes/01_Packages/Rust/Rust.sublime-syntax
 +++ syntaxes/01_Packages/Rust/Rust.sublime-syntax
+@@ -139 +139 @@ contexts:
+-    - match: \b(break|else|for|if|loop|match|while|continue)\b
++    - match: \b(async|await|break|else|for|if|loop|match|while|continue)\b
 @@ -907,6 +907,8 @@ contexts:
      - include: type-any-identifier
      - match: ':'

tests/syntax-tests/highlighted/Rust/output.rs

@@ -159,3 +159,7 @@
         }
     }
 }
+
+async fn foo() {
+    async_foo().await.await.await;
+}

tests/syntax-tests/source/Rust/output.rs

@@ -159,3 +159,7 @@ impl Drop for OutputType {
         }
     }
 }
+
+async fn foo() {
+    async_foo().await.await.await;
+}