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Attaching a patch...
Using Ronan's test_PyPyc.diff, before my patch:
{{{
~/dev/hg-repos/cpython$ ./python.exe -m unittest Lib/importlib/test/source/test_abc_loader.py 
...........................................E..................
======================================================================
ERROR: test_pyc_compatibility (Lib.importlib.test.source.test_abc_loader.RegeneratedBytecodeTests)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "./Lib/importlib/test/source/util.py", line 23, in wrapper
 to_return = fxn(*args, **kwargs)
 File "./Lib/importlib/test/source/test_abc_loader.py", line 473, in test_pyc_compatibility
 mock.load_module(name)
 File "<frozen importlib._bootstrap>", line 760, in load_module
 File "<frozen importlib._bootstrap>", line 408, in module_for_loader_wrapper
 File "<frozen importlib._bootstrap>", line 636, in _load_module
 File "./Lib/importlib/test/source/test_abc_loader.py", line 201, in get_code
 code_object = super().get_code(name)
 File "/Users/marca/dev/hg-repos/cpython/Lib/importlib/abc.py", line 305, in get_code
 return marshal.loads(bytecode)
ValueError: bad marshal data (unknown type code)
----------------------------------------------------------------------
Ran 62 tests in 0.076s
FAILED (errors=1)
[114118 refs]
}}}
After my patch:
{{{
~/dev/hg-repos/cpython$ patch -p1 < ~/Desktop/cpython-issue-15030.patch 
patching file Lib/importlib/abc.py
~/dev/hg-repos/cpython$ ./python.exe -m unittest Lib/importlib/test/source/test_abc_loader.py 
..............................................................
----------------------------------------------------------------------
Ran 62 tests in 0.079s
OK
[114118 refs]
}}}