[with patch, with positive review] very minor bug in calculs _complex_ coercion.

[was]

Still broken (or perhaps something deeper)

sage: complex(cos(3))
------------------------------------------------------------
Traceback (most recent call last):
  File "<ipython console>", line 1, in <module>
  File "/Users/robert/sage/current/local/lib/python2.5/site-packages/sage/calculus/calculus.py", line 3908, in __complex__
    return complex(f._approx_(complex(g)))
<type 'exceptions.TypeError'>: can't convert complex to float; use abs(z)

[was]

I noticed this very slight mistake recently...

[robertwb]

I approve.

[robertwb]

But there should be a doctest.

[robertwb]

The patch is good, the problem is that none of the python functions (e.g. sqrt, sin) handle complex values.

[was]

apply this after applying the other patch

[cwitty]

Looks good to me; doctests pass in sage/calculus and sage/rings. (Apply all three patches, in order.)

[mabshoff]

Merged in 2.8.15.rc0.