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I get the following failures under a fresh checkout:
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ERROR: test_file_to_source (test.test_import.ImportTests)
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Traceback (most recent call last):
 File "/home/antoine/t/cpython/Lib/test/test_import.py", line 253, in test_file_to_source
 make_legacy_pyc(source)
 File "/home/antoine/t/cpython/Lib/test/support.py", line 217, in make_legacy_pyc
 os.rename(pyc_file, legacy_pyc)
OSError: [Errno 2] No such file or directory
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ERROR: test___cached___legacy_pyc (test.test_import.PycacheTests)
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Traceback (most recent call last):
 File "/home/antoine/t/cpython/Lib/test/test_import.py", line 584, in test___cached___legacy_pyc
 pyc_file = make_legacy_pyc(self.source)
 File "/home/antoine/t/cpython/Lib/test/support.py", line 217, in make_legacy_pyc
 os.rename(pyc_file, legacy_pyc)
OSError: [Errno 2] No such file or directory
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ERROR: test_missing_source_legacy (test.test_import.PycacheTests)
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Traceback (most recent call last):
 File "/home/antoine/t/cpython/Lib/test/test_import.py", line 564, in test_missing_source_legacy
 pyc_file = make_legacy_pyc(self.source)
 File "/home/antoine/t/cpython/Lib/test/support.py", line 217, in make_legacy_pyc
 os.rename(pyc_file, legacy_pyc)
OSError: [Errno 2] No such file or directory
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FAIL: test_execute_bit_not_copied (test.test_import.ImportTests)
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Traceback (most recent call last):
 File "/home/antoine/t/cpython/Lib/test/test_import.py", line 112, in test_execute_bit_not_copied
 self.fail("__import__ did not result in creation of "
AssertionError: __import__ did not result in creation of either a .pyc or .pyo file
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FAIL: test_import_pyc_path (test.test_import.PycacheTests)
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Traceback (most recent call last):
 File "/home/antoine/t/cpython/Lib/test/test_import.py", line 531, in test_import_pyc_path
 self.assertTrue(os.path.exists('__pycache__'))
AssertionError: False is not true
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FAIL: test_missing_source (test.test_import.PycacheTests)
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Traceback (most recent call last):
 File "/home/antoine/t/cpython/Lib/test/test_import.py", line 552, in test_missing_source
 self.assertTrue(os.path.exists(pyc_file))
AssertionError: False is not true
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FAIL: test_unwritable_directory (test.test_import.PycacheTests)
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Traceback (most recent call last):
 File "/home/antoine/t/cpython/Lib/test/test_import.py", line 543, in test_unwritable_directory
 self.assertTrue(os.path.exists('__pycache__'))
AssertionError: False is not true

This is due to PYTHONDONTWRITEBYTECODE being set. Not sure this is worth fixing.

Duplicate of #12117.