Errors in async top-level functions do not result in traps

[jeffcharles]

Operating system: MacOS 14.4.1 (Sanoma) Processor architecture: Apple M3 Rust version: 1.77.1 Javy version: f270956bc9f7164efd4ea873d9f727356a4c1499

Problem

Errors in async functions do not result in error messages or traps.

Error Message and Context

Compiling and running:

(async function() {
    adfasdfsa;
})();

should throw a syntax error and trap. Right now it exits successfully with no error messages.

This does not require the experimental_event_loop feature to be enabled.