Move /src/test to /tests

src/test/ui/async-await/track-caller/async-block.rs

@@ -1,9 +0,0 @@
-// edition:2021
-
-#![feature(closure_track_caller, stmt_expr_attributes)]
-
-fn main() {
-    let _ = #[track_caller] async {
-        //~^ ERROR attribute should be applied to a function definition [E0739]
-    };
-}