Truffleruby: Failing rubocop's cop for grape gem

[gogainda]

For some reason when I ran the grape test suit it fails with

An error occurred while Style/FormatStringToken cop was inspecting /home/travis/build/ruby-grape/grape/lib/grape/exceptions/validation_errors.rb:9:30.

but it doesn't for Ruby MRI

The tests are passing btw, but this issue is blocking me from enabling Truffleruby head on grape's CI

Full logs are here

[jaime-rave-conichi]

That might be related to https://github.com/oracle/truffleruby/issues/1913

[eregon]

I believe this is fixed in RuboCop 0.90 and is a duplicate of https://github.com/oracle/truffleruby/issues/1913.
@gogainda Could you verify it works fine with RuboCop 0.90?

[gogainda]

@eregon @jaime-rave-conichi yep, rubocop works fine now