Issue #18083 has been updated by jeremyevans0 (Jeremy Evans). ioquatix (Samuel Williams) wrote in #note-29:
In the first instance, the question we need to answer is: "Is there a valid use case for $! (assuming dynamic scope as proposed) that isn't better addressed using existing techniques?".
If the answer is YES, we should implement it.
If the answer is NO, we should deprecate and remove `$!`.
This perspective ignores backwards compatibility. If the answer is NO, we would still need to determine if the benefit of removing `$!` exceeds the cost of the loss of backwards compatibility. ---------------------------------------- Feature #18083: Capture error in ensure block. https://bugs.ruby-lang.org/issues/18083#change-105694 * Author: ioquatix (Samuel Williams) * Status: Open * Priority: Normal ---------------------------------------- As discussed in https://bugs.ruby-lang.org/issues/15567 there are some tricky edge cases. As a general model, something like the following would be incredibly useful: ``` ruby begin ... ensure => error pp "error occurred" if error end ``` Currently you can get similar behaviour like this: ``` ruby begin ... rescue Exception => error raise ensure pp "error occurred" if error end ``` The limitation of this approach is it only works if you don't need any other `rescue` clause. Otherwise, it may not work as expected or require extra care. Also, Rubocop will complain about it. Using `$!` can be buggy if you call some method from `rescue` or `ensure` clause, since it would be set already. It was discussed extensively in https://bugs.ruby-lang.org/issues/15567 if you want more details. -- https://bugs.ruby-lang.org/