mkdir: created directory '_tmp/doc/ysh-tour'
_tmp/doc/ysh-tour -> (doctools/cmark) -> _release/VERSION/doc/ysh-tour.html
~/oil/_tmp/ysh-tour ~/oil
Traceback (most recent call last):
  File "/home/uke/oil/bin/oils_for_unix.py", line 27, in <module>
    from core import shell
  File "/home/uke/oil/core/shell.py", line 40, in <module>
    from builtin import dirs_osh
  File "/home/uke/oil/builtin/dirs_osh.py", line 15, in <module>
    from oil_lang import path_stat
ImportError: No module named oil_lang