Add closure allocation check to CI

[nemanja-boric-sociomantic]

@gavin-norman-sociomantic I looked at it again and the whole stack allocation thing looks rather pointless to me here. For example, TimerFD constructor will heap allocate exception instance internally - it doesn't matter that you create it as scope t = new TimerFD, there will be GC activity anyway.

That's a pretty good point. For some reason I believed that the scope was transitive.

[mihails-strasuns-sociomantic]

That's a pretty good point.

Nevermind that (I deleted the comment) - old code was creating exception field separately on scope for exactly that reason. I reproduced it in last version.

[mihails-strasuns-sociomantic]

Updated - not WIP anymore:

• Documentation tweak as requested by @gavin-norman-sociomantic
• Regexp improvement as suggested by @leandro-lucarella-sociomantic

[mihails-strasuns-sociomantic]

Ping @leandro-lucarella-sociomantic @gavin-norman-sociomantic

[mihails-strasuns-sociomantic]

Ping

[gavin-norman-sociomantic]

Ah I hadn't noticed that you'd fixed the release notes.