[Feature Request] Warn on single line rescues with an exception value

[caspiano]

Single-line rescue expressions swallow all exceptions, returning the argument to the rescue.

It's a relatively common mistake to put an exception as the argument, mistakingly assuming that it will rescue from that exception alone, rather than all exceptions.

See the example below.

class SpecificError < Exception
end

class OtherError < Exception
end

def raises_other_error
  raise OtherError.new
end

result = raises_other_error rescue SpecificError

puts result # => SpecificError

I propose that ameba produces a warning when the argument to a single-line rescue is an exception.