This construct is used in `dry-monads` specs https://github.com/dry-rb/dry-monads/blob/master/spec/unit/try_spec.rb#L14 `$ERROR_INFO` is alias of `$!` TruffleRuby 1.0.0 RC15 ```ruby require 'English' division_error = 1 / 0 rescue $ERROR_INFO # => nil ``` MRI 2.6.2 ```ruby require 'English' division_error = 1 / 0 rescue $ERROR_INFO # => #<ZeroDivisionError: divided by 0> ```