Thanks Volker for releasing SageMath 8.9.rc0.

On Cygwin64 in Windows 7, updated a py2 and a py3 Sage
from 8.9.beta8 using `git pull origin develop`. Running `make`
worked for both. Here is what running `make testlong` gave
in each case.

## py2

Two files had failures, not reproduced when run individually.

$ make testlong
...
----------------------------------------------------------------------
sage -t --long --warn-long 152.9 src/sage/doctest/forker.py  # 4 doctests failed
sage -t --long --warn-long 152.9
src/sage/tests/books/computational-mathematics-with-sagemath/sol/numbertheory_doctest.py
 # 3 doctests failed
----------------------------------------------------------------------
Total time for all tests: 21338.3 seconds
    cpu time: 12435.7 seconds
    cumulative wall time: 18662.0 seconds

$ ./sage -t --long --warn-long 152.9 src/sage/doctest/forker.py
Running doctests with ID 2019-09-13-13-58-02-c739be9f.
Git branch: develop
Using --optional=build,dochtml,python2,sage
Doctesting 1 file.
sage -t --long --warn-long 152.9 src/sage/doctest/forker.py
    [449 tests, 39.92 s]
----------------------------------------------------------------------
All tests passed!
----------------------------------------------------------------------
Total time for all tests: 85.7 seconds
    cpu time: 6.2 seconds
    cumulative wall time: 39.9 seconds

$ ./sage -t --long --warn-long 152.9
src/sage/tests/books/computational-mathematics-with-sagemath/sol/numbertheory_doctest.py
Running doctests with ID 2019-09-13-14-00-08-2f37b831.
Git branch: develop
Using --optional=build,dochtml,python2,sage
Doctesting 1 file.
sage -t --long --warn-long 152.9
src/sage/tests/books/computational-mathematics-with-sagemath/sol/numbertheory_doctest.py
    [19 tests, 31.48 s]
----------------------------------------------------------------------
All tests passed!
----------------------------------------------------------------------
Total time for all tests: 32.0 seconds
    cpu time: 23.7 seconds
    cumulative wall time: 31.5 seconds



## py3

Three files had failures, reproduced when run individually.

$ make testlong
...
----------------------------------------------------------------------
sage -t --long --warn-long 152.9 src/sage/libs/eclib/interface.py  # 1
doctest failed
sage -t --long --warn-long 152.9
src/sage/rings/polynomial/polynomial_rational_flint.pyx  # 1 doctest
failed
sage -t --long --warn-long 152.9 src/sage_setup/clean.py  # 1 doctest failed
----------------------------------------------------------------------
Total time for all tests: 20686.3 seconds
    cpu time: 11933.1 seconds
    cumulative wall time: 18129.0 seconds

$ ./sage -t --long --warn-long 152.9 src/sage/libs/eclib/interface.py
Running doctests with ID 2019-09-13-14-29-15-826f92d4.
Git branch: develop
Using --optional=build,dochtml,python2,sage
Doctesting 1 file.
sage -t --long --warn-long 152.9 src/sage/libs/eclib/interface.py
**********************************************************************
File "src/sage/libs/eclib/interface.py", line 597, in
sage.libs.eclib.interface.mwrank_EllipticCurve.saturate
Failed example:
    E.saturation([Q1,Q2])
Expected:
    ([(1 : -27 : 1), (157 : 1950 : 1)], 3, 0.801588644684981)
Got:
    Attempt to round -0.2617840677e25 to a long int fails, aborting!
    ([(1 : -27 : 1), (157 : 1950 : 1)], 3, 0.801588644684981)
**********************************************************************
1 item had failures:
   1 of   9 in sage.libs.eclib.interface.mwrank_EllipticCurve.saturate
    [192 tests, 1 failure, 7.16 s]
----------------------------------------------------------------------
sage -t --long --warn-long 152.9 src/sage/libs/eclib/interface.py  # 1
doctest failed
----------------------------------------------------------------------
Total time for all tests: 7.8 seconds
    cpu time: 6.1 seconds
    cumulative wall time: 7.2 seconds

$ ./sage -t --long --warn-long 152.9
src/sage/rings/polynomial/polynomial_rational_flint.pyx
Running doctests with ID 2019-09-13-14-32-07-942278a6.
Git branch: develop
Using --optional=build,dochtml,python2,sage
Doctesting 1 file.
sage -t --long --warn-long 152.9
src/sage/rings/polynomial/polynomial_rational_flint.pyx
**********************************************************************
File "src/sage/rings/polynomial/polynomial_rational_flint.pyx", line
2055, in 
sage.rings.polynomial.polynomial_rational_flint.Polynomial_rational_flint.galois_group
Failed example:
    G = f.galois_group(); G
Expected:
    Transitive group number 5 of degree 4
Got:
    Exception (FLINT memory_manager). Unable to allocate memory.
    Transitive group number 5 of degree 4
**********************************************************************
1 item had failures:
   1 of  16 in 
sage.rings.polynomial.polynomial_rational_flint.Polynomial_rational_flint.galois_group
    [397 tests, 1 failure, 9.09 s]
----------------------------------------------------------------------
sage -t --long --warn-long 152.9
src/sage/rings/polynomial/polynomial_rational_flint.pyx  # 1 doctest
failed
----------------------------------------------------------------------
Total time for all tests: 9.7 seconds
    cpu time: 5.7 seconds
    cumulative wall time: 9.1 seconds

$ ./sage -t --long --warn-long 152.9 src/sage_setup/clean.py
Running doctests with ID 2019-09-13-14-32-53-e541ca46.
Git branch: develop
Using --optional=build,dochtml,python2,sage
Doctesting 1 file.
sage -t --long --warn-long 152.9 src/sage_setup/clean.py
**********************************************************************
File "src/sage_setup/clean.py", line 100, in sage_setup.clean._find_stale_files
Failed example:
    for f in stale_iter:
        if f.endswith(skip_extensions): continue
        print('Found stale file: ' + f)
Expected nothing
Got:
    Found stale file: sage/graphs/__pycache__/line_graph.cpython-37.pyc
**********************************************************************
1 item had failures:
   1 of  11 in sage_setup.clean._find_stale_files
    [17 tests, 1 failure, 3.54 s]
----------------------------------------------------------------------
sage -t --long --warn-long 152.9 src/sage_setup/clean.py  # 1 doctest failed
----------------------------------------------------------------------
Total time for all tests: 4.1 seconds
    cpu time: 1.4 seconds
    cumulative wall time: 3.5 seconds

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