Test hang with symbolic 2.7.1

[Orion Poplawski]

From https://savannah.gnu.org/bugs/?56234

Trying to build octave-symbolic 2.7.1 or latest git on Fedora 30+ the 
following test hangs:

/home/orion/rpmbuild/BUILDROOT/octave-symbolic-2.7.1-5.fc31.x86_64/usr/share/octave/packages/symbolic-2.7.1/@sym/zeta.m 
Fatal Python error: Cannot recover from stack overflow.

Current thread 0x00007fad71c4f680 (most recent call first):
File "/usr/lib/python3.7/site-packages/sympy/core/sympify.py", line 293 
in sympify
File "/usr/lib/python3.7/site-packages/sympy/core/containers.py", line 
51 in <genexpr>
File "/usr/lib/python3.7/site-packages/sympy/core/containers.py", line 
52 in _new_
File "/usr/lib/python3.7/site-packages/sympy/core/containers.py", line 
146 in <lambda>
File "/usr/lib/python3.7/site-packages/sympy/core/sympify.py", line 293 
in sympify
File "/usr/lib/python3.7/site-packages/sympy/core/containers.py", line 
51 in <genexpr>
File "/usr/lib/python3.7/site-packages/sympy/core/containers.py", line 
52 in _new_
File "/usr/lib/python3.7/site-packages/sympy/core/containers.py", line 
146 in <lambda>
File "/usr/lib/python3.7/site-packages/sympy/core/sympify.py", line 293 
in sympify
File "/usr/lib/python3.7/site-packages/sympy/core/function.py", line 
1218 in _new_
File "/usr/lib/python3.7/site-packages/sympy/core/function.py", line 
1556 in _eval_derivative
File "/usr/lib/python3.7/site-packages/sympy/core/basic.py", line 1663 
in _visit_eval_derivative_scalar
File "/usr/lib/python3.7/site-packages/sympy/core/basic.py", line 1658 
in _accept_eval_derivative
File "/usr/lib/python3.7/site-packages/sympy/core/basic.py", line 1682 
in _eval_derivative_n_times
File "/usr/lib/python3.7/site-packages/sympy/core/function.py", line 
1392 in _new_
File "/usr/lib/python3.7/site-packages/sympy/core/expr.py", line 3095 in 
diff
File "/usr/lib/python3.7/site-packages/sympy/core/function.py", line 
2115 in doit
File "/usr/lib/python3.7/site-packages/sympy/core/function.py", line 
2136 in evalf
File "/usr/lib/python3.7/site-packages/sympy/core/function.py", line 
2136 in evalf
File "/usr/lib/python3.7/site-packages/sympy/core/function.py", line 
2136 in evalf
File "/usr/lib/python3.7/site-packages/sympy/core/function.py", line 
2136 in evalf
File "/usr/lib/python3.7/site-packages/sympy/core/function.py",
...
Waiting..............................................

This is with:
python3-3.7.3-2.fc31.x86_64
python3-sympy-1.4-1.fc31.noarch
octave-4.4.1-7.fc31.x86_64

Not sure where this is failing or how to further debug it.

--
Orion Poplawski
Manager of NWRA Technical Systems          720-772-5637
NWRA, Boulder/CoRA Office             FAX: 303-415-9702
3380 Mitchell Lane                       address@hidden
Boulder, CO 80301                 https://www.nwra.com/

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