Could you also add a test for this?

(Note: the suggested reviewers were autoselected by the import keyword, and might not know too much about this part of the stdlib. Adding Benjamin as the lib2to3 expert.)

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This is a nice to have feature for outside usages but unfortunately, the current test suite doesn't offer a direct way to test it with the given interface of fixers.

Also, I am now reconsidering if this suits the concept of lib2to3 fixers and their public utilities. @benjaminp what do you think about supporting these symbols in the fixer for outside usages (e.g: packages like unimport) ?

[closing as this was an nice-to-have enhancement, and lib2to3 will be deprecated soon and this will probably not going to be in time for 3.9]