fix corner case in inline (#5529)

fixes #5528

test/ufuzz/index.js

@@ -2104,9 +2104,9 @@ if (require.main !== module) {
 function run_code(code, toplevel, timeout) {
     if (async && has_await) code = [
         '"use strict";',
-        "(async function(){",
+        "(async ()=>{",
         code,
-        "})();"
+        "})().catch(e=>console.log(e));",
     ].join("\n");
     return sandbox.run_code(sandbox.patch_module_statements(code), toplevel, timeout);
 }