Traceback (most recent call last): File "/home/andy/git/oil/sketch/pysh.py", line 287, in  sys.exit(main(sys.argv)) File "/home/andy/git/oil/sketch/pysh.py", line 261, in main node = c_parser.ParseFile() File "/home/andy/git/oil/sketch/cmd_parse.py", line 1476, in ParseFile node = self.ParseCommandTerm() File "/home/andy/git/oil/sketch/cmd_parse.py", line 1396, in ParseCommandTerm if not self._Peek(): return None File "/home/andy/git/oil/sketch/cmd_parse.py", line 65, in _Peek w = self.w_parser.ReadWord(self.next_lex_state) File "/home/andy/git/oil/sketch/word_parse.py", line 1124, in ReadWord word, need_more = self._Read(lex_state) File "/home/andy/git/oil/sketch/word_parse.py", line 1087, in _Read w = self._ReadCommandWord(lex_state=lex_state) File "/home/andy/git/oil/sketch/word_parse.py", line 905, in _ReadCommandWord part = self._ReadLeftParts() File "/home/andy/git/oil/sketch/word_parse.py", line 579, in _ReadLeftParts raise NotImplementedError('$"" not implemented') NotImplementedError: $"" not implemented