class RSpec::Core::RakeTask

false
default:

not add 'bundle exec' to the command.
'bundle exec'. Set this to true to ignore the presence of a Gemfile, and
By default, if there is a Gemfile, the generated command will include

ENV['BUNDLE_GEMFILE'] instead.
Deprecated and has no effect. The rake task now checks

def skip_bundler=(*)
  RSpec.deprecate("RSpec::Core::RakeTask#skip_bundler=")
end