fix expect

Author: hamishknight

test/Concurrency/toplevel/main.swift

@@ -1,5 +1,5 @@
-// RUN: not %target-swift-frontend -enable-experimental-async-top-level -swift-version 6 -typecheck %s %S/Inputs/foo.swift 2>&1 | %FileCheck %s --check-prefixes='Swift6-CHECK,CHECK'
-// RUN: not %target-swift-frontend -enable-experimental-async-top-level -swift-version 5 -typecheck %s %S/Inputs/foo.swift 2>&1 | %FileCheck %s --check-prefixes='Swift5-CHECK,CHECK'
+// RUN: not %target-swift-frontend -enable-experimental-async-top-level -diagnostic-style=llvm -swift-version 6 -typecheck %s %S/Inputs/foo.swift 2>&1 | %FileCheck %s --check-prefixes='Swift6-CHECK,CHECK'
+// RUN: not %target-swift-frontend -enable-experimental-async-top-level -diagnostic-style=llvm -swift-version 5 -typecheck %s %S/Inputs/foo.swift 2>&1 | %FileCheck %s --check-prefixes='Swift5-CHECK,CHECK'
 
 var a = 10
 
@@ -18,8 +18,6 @@ func nonIsolatedSynchronous() {
 
 func nonIsolatedAsync() async {
     print(a)
-// CHECK: expression is 'async' but is not marked with 'await'
-// CHECK: property access is 'async'
 }
 
 await nonIsolatedAsync()