ImportError: cannot import name 'Ensurer' from 'xonsh.__amalgam__'

[jakirkham]

After installing the libcflib package from conda-forge and importing, am seeing the following error. Tried with the latest xonsh and 0.9.24 based on this pin

In [1]: import libcflib
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
Input In [1], in <cell line: 1>()
----> 1 import libcflib

File ~/miniconda/lib/python3.9/site-packages/libcflib/__init__.py:9, in <module>
      6 del setup
      8 # setup environment
----> 9 from libcflib.environ import setup
     11 setup()
     12 del setup

File ~/miniconda/lib/python3.9/site-packages/libcflib/environ.py:8, in <module>
      5 from contextlib import contextmanager
      6 from collections.abc import MutableMapping
----> 8 from xonsh.environ import Ensurer, VarDocs
      9 from xonsh.tools import always_false, ensure_string, is_string, is_int
     11 from libcflib.tools import expand_file_and_mkdirs

ImportError: cannot import name 'Ensurer' from 'xonsh.__amalgam__' (/Users/jkirkham/miniconda/lib/python3.9/site-packages/xonsh/__amalgam__.py)