class RSpec::Core::Configuration

def debug=(bool)
  if bool
    # Usually this is called automatically by the --debug CLI option, so the
    # deprecation message doesn't mention `RSpec::Core::Configuration#debug=`
    RSpec.deprecate("RSpec's built-in debugger support",
                    :replacement => "a CLI option like `-rruby-debug` or `-rdebugger`")
  else
    # ...but the only way to call this with a false value is to
    # call it directly, so here we mention the method name.
    # There's no replacement for it since it's a no-op, though.
    RSpec.deprecate("RSpec::Core::Configuration#debug=")
  end
  return unless bool
  begin
    require 'ruby-debug'
    Debugger.start
  rescue LoadError => e
    raise <<-EOM
50}
ssage}
 have it installed as a ruby gem, then you need to either require
ems' or configure the RUBYOPT environment variable with the value
ems'.
cktrace.join("\n")}
50}
  end
end