scalar  : B_LITERAL_START scalar_group B_LITERAL_END

def p_scalar__literal(self, p):
        """
        scalar  : B_LITERAL_START scalar_group B_LITERAL_END
        """
        scalar_group = ''.join(p[2])
        p[0] = ScalarDispatch('%s\n' % dedent(scalar_group).replace('\n\n\n', '\n'), cast='str')