Custom errors that extend "Exception" don't get caught by bare rescue statements.

exception_test.rb

#
# Custom error classes that extend Exception don't get caught by catch-all/bare rescue statements.
#

class ExtendsStandardError < StandardError; end
class ExtendsException < Exception; end


begin
  raise ExtendsStandardError, "Burn."
rescue
  puts "ExtendsStandardError caught."
end


begin
  raise ExtendsException, "Burn."
rescue
  puts "ExtendsException caught."
end

puts "Both caught."

# outputs:
#
# ExtendsStandardError caught.
# exception_test.rb:13: Burn. (ExtendsException)
#