@mattiem@mastodon.social @bok@mastodon.social I think Concurrency as a whole has come really far in terms of understandability. One part that still has some rough edges though is region based isolation. Especially the topic with call once closures (or the lack of) but also compiler error messages related to RBI. I sometimes have to shuffle variables around just to understand which property is causing the error (eg. captured in sending closures)