has_key? is deprecated in favor of key?
indentation
Missing space after #
Literal true appeared in a condition
Favor until over while for negative conditions
Never use do with multi-line until
Avoid multi-line chains of blocks
Redundant  block detected
Redundant  detected
Avoid rescuing the Exception class
Useless assignment to variable
Never use unless with else
Name  block params |a, e|
Don't use parentheses around the condition
Avoid the use of Perl-style backrefs
Use ! instead of not
Provide an exception class and message as arguments to fail