Status: Accepted
Owner: ----
Labels: Type-Defect Priority-High

New issue 2956 by pr...@goodok.ru: Simetimes the test_hyperexpand.py (test_meijerg_shift_operators) fails in master.
http://code.google.com/p/sympy/issues/detail?id=2956

This test function uses the random source values, and it fails with the random seed e.g. equal to 59929712 (in currect master branch).

$ ./bin/test test_hyperexpand.py --seed=59929712

File "sympy/simplify/tests/test_hyperexpand.py", line 444, in test_meijerg_shift_operators
    s = MeijerUnShiftD([a1], [a3, a4], [b1], [b3, b4], 0, z)
File "/media/Data_1Tb/projects_python/sympy/my/sympy/simplify/hyperexpand.py", line 1273, in __init__
    raise ValueError('Cannot increment lower a index (cancels)')
ValueError: Cannot increment lower a index (cancels)



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