Hi,

I'm recently focusing on resolve some of the issues about numexpr and I
found that in numexpr's test module, it will run:

`from numpy import (...., complex_, .....)`

And when I run `numexpr.test()` the output looks like:

Traceback (most recent call last):
  File 
"/Users/liuteng/opt/anaconda3/envs/test_ne/lib/python3.9/site-packages/numexpr-2.8.8.dev1-py3.9-macosx-10.9-x86_64.egg/numexpr/__init__.py",
line 64, in test
    import numexpr.tests
  File 
"/Users/liuteng/opt/anaconda3/envs/test_ne/lib/python3.9/site-packages/numexpr-2.8.8.dev1-py3.9-macosx-10.9-x86_64.egg/numexpr/tests/__init__.py",
line 11, in <module>
    from numexpr.tests.test_numexpr import test, print_versions
  File 
"/Users/liuteng/opt/anaconda3/envs/test_ne/lib/python3.9/site-packages/numexpr-2.8.8.dev1-py3.9-macosx-10.9-x86_64.egg/numexpr/tests/test_numexpr.py",
line 21, in <module>
    from numpy import (
ImportError: cannot import name 'complex_' from 'numpy'
(/Users/liuteng/opt/anaconda3/envs/test_ne/lib/python3.9/site-packages/numpy/__init__.py)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File 
"/Users/liuteng/opt/anaconda3/envs/test_ne/lib/python3.9/site-packages/numexpr-2.8.8.dev1-py3.9-macosx-10.9-x86_64.egg/numexpr/__init__.py",
line 68, in test
    raise ImportError('`numexpr.tests` could not be imported, likely
it was excluded from the distribution.')
ImportError: `numexpr.tests` could not be imported, likely it was
excluded from the distribution

Then I replace it with `cdouble` and everthing is fine then.

So I'm curious what `complex_` was.

Thanks in advance!
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