[dwohnitmok]

Maybe I'm misunderstanding how abilities work, but I think I can break Exception.bracket with this right?

I think if I pass something that has e.g. `{Abort, Exception, IO}` to `bracket` and then handle Exception before Abort, my Abort handler can break out of `bracket` before the finalizer action can run.

More generally I must always process any ability with a "bracket"-like function last to prevent this from happening right? And if I have multiple abilities that all have "bracket"-like functions they can step on each other's toes?

Even more generally I think any sort of "scoped" function in an ability has this problem.

This theoretically seems scary (imagine you have some big complicated action that does some bracket deep under the covers to e.g. release file handles; if I handle abilities in the wrong order the file handles might not ever be released, even if I have individually reasonable ability-handler pairs that locally don't do anything silly), but I'm not sure practically how often this comes up, and how much "just always handle Exception last" fixes that (i.e. how unlikely it is for any other ability to have a bracket function).

[zawodnaya]

This is true, if you write `bracket` for e.g. `Exception`, then you can break out of the bracket with `abort` if your bracket doesn't handle aborts.

So if you want to be really sure of resource cleanup, you should use something like the `Resource` ability to acquire resources:

https://share.unison-lang.org/@runarorama/code/latest/namesp...

[dwohnitmok]

Got it. But you're locked into IO and Exception then and can't use any other abilities right? I guess you could always convert back and forth at the `run` boundary.

Also I would suggest removing Exception.bracket from base then, or at least changing the file handle example for Exception.bracket, since it seems a tad dangerous.