...don't check if the function allocates?

Allocations can hide behind function calls anyway.

It...

...some GC allocations, but not want a closure allocated. Or you simply want allocations to...

...reference to my concern about hidden implicit allocations that I made in the comments thread...

...syntax that may invisibly result
in random allocations at any function callsite. It's also...

...s plenty of tools to prevent implicit allocations and if the delegate is dropped after...

...library solutions are pursued for handling memory allocations/garbage collecting when the runtime already exists...

...and it's very easy for such allocations to go unnoticed. It's completely invisible...

...system results in more usage of heap allocations.
(or even requires it due to borrow...

...just fine, and will avoid unnecessary GC allocations.



Make it a struct, and make all...

...have some performance impact compared to manual allocations.

My personal opinion is that if one...