fails:The ** operator makes a copy when calling a method taking a positional Hash
fails:The ** operator hash with omitted value raises a SyntaxError when the hash key ends with `!`
fails:The ** operator hash with omitted value raises a SyntaxError when the hash key ends with `?`
fails(low-priority missing syntax error):Hash literal raises a SyntaxError at parse time when Symbol key with invalid bytes and 'key: value' syntax used
