It seems the issues were also identified upstream and fixed (via [1] and other 3.8-related commits), and made it into a new upstream release (the 2.x line [2]) - I have updated the VCS preparing the new version.
[1] https://github.com/gristlabs/asttokens/pull/36 [2] https://github.com/gristlabs/asttokens/releases -- Diego M. Rodriguez
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