Fork, and normal worker threads always enter a script, there's clearly no shared lexical scope. This spawn method executes a function, but that fn can't interact with the scope outside

While I agree with GP that this should be the expected behavior, your comment raises what I think is a large problem/wild-goose-chase in ‘modern’ language designs implementing concurrency.

The push from language designers (this applies across the high/low level spectrum and at all ranges of success for languages) to make concurrent code ‘look just like’ linearly read, synchronous, single-threaded code is pervasive and seems to avoid large pushback by users of the language. The complaints that should be made against this syntax design become complaints that code doesn’t do what developers think it should.

My position is that concurrent (and parallel) code IS NOT sequential code and languages should embrace those differences. The move to or design of async/await is often explicitly argued for from this position. But the semantic differences in concurrent code IMO should not be obscured or obfuscated by seeking to conform that code to sequential code’s syntax.

As soon as I read your username, I had to read it out loud to my girlfriend. Why is it so funny