Small fix for Ruby 1.8 (specs only)
Small fix for Ruby 1.8 (specs only)

kschiess/parslet,hggh/parslet,NigelThorne/parslet,NigelThorne/parslet,hggh/parslet,eeeyes/parslet,kwangkim/parslet,eeeyes/parslet,kschiess/parslet,NigelThorne/parslet,kwangkim/parslet,eeeyes/parslet,hggh/parslet,kschiess/parslet,kwangkim/parslet