Faster error checking with Ripper

[schneems]

require 'ripper'
require 'parser/current'
require 'benchmark/ips'

script = <<~EOM
  def lol
    puts "lol"
  end
EOM

Benchmark.ips do |x|
  x.report("ripper    ") { Ripper.new(script).tap(&:parse).error? }
  x.report("whitequark") { Parser::CurrentRuby.parse(script) } 
  x.compare!
end

Warming up --------------------------------------
          ripper
     9.624k i/100ms
          whitequark   717.000  i/100ms
Calculating -------------------------------------
          ripper         94.945k (± 3.5%) i/s -    481.200k in   5.074242s
          whitequark      7.489k (± 3.0%) i/s -     38.001k in   5.079192s

Comparison:
          ripper    :    94945.0 i/s
          whitequark:     7488.6 i/s - 12.68x  (± 0.00) slower

Upsides:

• WAAAAY faster. Probably meaningfully faster.
• Ripper#error? Looks like it's available in all currently non EOL ruby versions (tested 2.5 and 2.7)

Downside:

• I can't find out which error was raised in parsing directly from ripper the same way I can with whitequark (parser gem).

I could use ripper purely for speed, and keep the whitequark gem in there for detecting which syntax error was raised for the short term.