Naive unique_ptr abstract fix

3 jobs for !180 with bug/fixup-unique-constructor in 11 minutes and 11 seconds (queued for 1 second)
merge request
Name Stage Failure
failed
windows Build
   Uploaded: C:/glr/builds/autopybind11/1C86z2Yk/0/autopybind11/autopybind11/build/Testing/20210603-2152/Test.xml
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Errors while running CTest


Cleaning up file based variables
ERROR: Job failed: exit status 1
failed
python3 Build
   Uploaded: /builds/autopybind11/autopybind11/build/Testing/20210603-2150/Test.xml
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Errors while running CTest
Output from these tests are in: /builds/autopybind11/autopybind11/build/Testing/Temporary/LastTest.log
Use "--rerun-failed --output-on-failure" to re-run the failed cases verbosely.
Cleaning up file based variables
ERROR: Job failed: exit code 1