Looks fine on Ubuntu 14.04 machine.

Sometimes when I run the tests I get failures like:

sage -t --long src/sage/combinat/cluster_algebra_quiver/quiver.py
**********************************************************************
File "src/sage/combinat/cluster_algebra_quiver/quiver.py", line 172,
in sage.combinat.cluster_algebra_quiver.quiver.ClusterQuiver
Failed example:
    Q.mutation_type()
Exception raised:
    Traceback (most recent call last):
      File 
"src/sagemath/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py",
line 659, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"src/sagemath/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py",
line 1070, in compile_and_execute
        exec(compiled, globs)
      File "<doctest
sage.combinat.cluster_algebra_quiver.quiver.ClusterQuiver[34]>", line
1, in <module>
        Q.mutation_type()
      File 
"src/sagemath/sage/local/lib/python2.7/site-packages/sage/combinat/cluster_algebra_quiver/quiver.py",
line 1009, in mutation_type
        mut_type_part = _mutation_type_from_data(
dg_component.order(), dig6, compute_if_necessary=False )
      File 
"src/sagemath/sage/local/lib/python2.7/site-packages/sage/combinat/cluster_algebra_quiver/mutation_type.py",
line 1313, in _mutation_type_from_data
        data = load_data(n)
      File "sage/misc/cachefunc.pyx", line 1005, in
sage.misc.cachefunc.CachedFunction.__call__
(build/cythonized/sage/misc/cachefunc.c:6302)
        w = self.f(*args, **kwds)
      File 
"src/sagemath/sage/local/lib/python2.7/site-packages/sage/combinat/cluster_algebra_quiver/mutation_type.py",
line 1288, in load_data
        data_new = cPickle.load(fobj)
    ValueError: unsupported pickle protocol: 3

This is because I'm using the same machine to build and test Python 3,
and that code is caching some computations as pickles in .sage/; so
when I run them on Python 3 it ends up with some Python 3 pickles in
.sage.

I believe these tests ought to be fixed to not use the user's real
.sage since that's hard to control for.  But that's a minor issue and
not particular to this release.  It just gets me almost every time :)
On Mon, Oct 1, 2018 at 12:55 AM Volker Braun <vbraun.n...@gmail.com> wrote:
>
> As always, you can get the latest beta version from the "develop" git branch. 
> Alternatively, the self-contained source tarball is at 
> http://www.sagemath.org/download-latest.html
>
>
> a1bfef8cf3 (tag: 8.4.beta7, trac/develop) Updated SageMath version to 
> 8.4.beta7
> cbd85e1df0 Trac #26353: MR1: Remove special case for Cygwin for BLAS 
> detection when installing fflas_ffpack
> a090fd23c8 Trac #25913: Allow input as packed words for Hopf algebra WQSym
> 4048cdea8c Trac #26352: Lie algebra quotients are incorrect for some basis 
> orders
> 958b066cf6 Trac #26232: enhance pari conversion of elliptic curves over 
> number field
> dfa5859869 Trac #25435: Global function fields: orders and ideals
> cf373c1968 Trac #12567: Implement p-adic n-th roots
> 83f13e288a Trac #26350: Add citations to polymake papers
> e643ef4bf4 Trac #26346: py3: a bit of work in src/doc
> fdfbfef6ab Trac #26347: clean deprecation warning in doctests for paths.py + 
> animate.py
> 15dbacc580 Trac #26342: Improve triconnectivity algorithm: avoid recursive 
> calls
> 24442c1091 Trac #25057: Building ecl-16.1.2 fails on some Cygwin versions
> 19cff46d56 Trac #24589: Pickling matrices over GF(2) does not preserve their 
> immutability
> 039b874739 Trac #26080: The Baker-Campbell-Hausdorff formula for nilpotent 
> Lie algebras
> d72db87107 Trac #26016: py3: miscellaneous fixes and cleanup to sage.sandpiles
> 02e5631e78 Trac #26011: Copying package files is really slow
> 6e84381666 Trac #26341: py3: misc open(...) -> with open(...) fixes
> bbc97631c5 Trac #26325: Upgrade nose to 1.3.7
> d8efd6a554 Trac #26323: small update of faq_usage
> cabf20b1dd Trac #26299: py3: use repr for floats in plot3d file format outputs
> 9ad5cf0c99 Trac #26335: PicoSAT solver
> df44cb2c3c Trac #26334: Package pycosat
> a74f7590ad Trac #26329: Allow xor clause in DIMACS files (format extended by 
> cryptominisat)
> 957af679a7 Trac #25395: Support for binary quintics in invariant_theory
> e2e3f3f9bd Trac #26338: Fix documentation formatting in modular symbol space
> 7c8d581c7c Trac #26336: Fix latex typos in sfa.py
> 614c0368ec Trac #26227: Make search_doc independent of sage_setup
> b84538eeea (tag: 8.4.beta6) Updated SageMath version to 8.4.beta6
>
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