======================================================================
ERROR: test_umath.TestComplexFunctions.test_loss_of_precision(<class 'numpy.complex64'>,)
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Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/nose/case.py", line 198, in runTest
    self.test(*self.arg)
  File "/usr/lib64/python2.7/site-packages/numpy/core/tests/test_umath.py", line 1845, in check_loss_of_precision
    check(x_series, 2.1*eps)
  File "/usr/lib64/python2.7/site-packages/numpy/core/tests/test_umath.py", line 1814, in check
    d = np.absolute(np.arcsinh(x)/np.arcsinh(z).real - 1)
RuntimeWarning: divide by zero encountered in true_divide

======================================================================
ERROR: test_umath.TestComplexFunctions.test_loss_of_precision(<class 'numpy.complex128'>,)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/nose/case.py", line 198, in runTest
    self.test(*self.arg)
  File "/usr/lib64/python2.7/site-packages/numpy/core/tests/test_umath.py", line 1845, in check_loss_of_precision
    check(x_series, 2.1*eps)
  File "/usr/lib64/python2.7/site-packages/numpy/core/tests/test_umath.py", line 1814, in check
    d = np.absolute(np.arcsinh(x)/np.arcsinh(z).real - 1)
RuntimeWarning: divide by zero encountered in true_divide

======================================================================
ERROR: test_umath.TestComplexFunctions.test_loss_of_precision_longcomplex
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/nose/case.py", line 198, in runTest
    self.test(*self.arg)
  File "/usr/lib64/python2.7/site-packages/numpy/testing/decorators.py", line 217, in knownfailer
    return f(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/numpy/core/tests/test_umath.py", line 1892, in test_loss_of_precision_longcomplex
    self.check_loss_of_precision(np.longcomplex)
  File "/usr/lib64/python2.7/site-packages/numpy/core/tests/test_umath.py", line 1843, in check_loss_of_precision
    check(x_series, 50*eps)
  File "/usr/lib64/python2.7/site-packages/numpy/core/tests/test_umath.py", line 1814, in check
    d = np.absolute(np.arcsinh(x)/np.arcsinh(z).real - 1)
RuntimeWarning: divide by zero encountered in true_divide