Feature #19620: allow non-module rescue filters that implement the === opertor

• Status: Open
• Assignee: -
• Target version: -

[bughit (bug hit)]

module FooErrorFilter
  def self.===(e)
    e.message =~ /foo/
  end
end

def foo_error_filter
  FooErrorFilter
end

begin
  raise 'foo error'
rescue foo_error_filter => e
  p e.message
end

Filter matching is done via the === operator, which is why the rescue filter modules don't need to be exception classes. But they are required to be modules, why? Since the rescue filter object is only used for the === operator it should accept any object supporting it. The module restriction seems arbitrary and pointless.

begin
  raise 'foo error'
rescue ->e{e.message =~ /foo/}
  p e.message
end

[byroot (Jean Boussier)]

• Related to Bug #4438: rescue args type check omitted added