[ruby-core:105715] [Ruby master Feature#18083] Capture error in ensure block.
From:
"ko1 (Koichi Sasada)" <noreply@...>
Date:
2021-10-21 06:13:18 UTC
List:
ruby-core #105715
Issue #18083 has been updated by ko1 (Koichi Sasada).
Sorry, my proposal is introducing dynamic scope, not syntactical scope like:
```
def foo
p $! #=> A
begin
# no raise
ensure
p $! #=> nil
end
end
begin
raise A
ensure
foo
end
```
We can implement `raise` like method:
```ruby
def my_raise
# DO SOMETHING
raise $!
end
```
----------------------------------------
Feature #18083: Capture error in ensure block.
https://bugs.ruby-lang.org/issues/18083#change-94213
* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
----------------------------------------
As discussed in https://bugs.ruby-lang.org/issues/15567 there are some tricky edge cases.
As a general model, something like the following would be incredibly useful:
``` ruby
begin
...
ensure => error
pp "error occurred" if error
end
```
Currently you can get similar behaviour like this:
``` ruby
begin
...
rescue Exception => error
raise
ensure
pp "error occurred" if error
end
```
The limitation of this approach is it only works if you don't need any other `rescue` clause. Otherwise, it may not work as expected or require extra care. Also, Rubocop will complain about it.
Using `$!` 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.
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