Mention issue, closed with #164
Mention issue, closed with #164

In [1]: import diofant.core.function

In [2]: diofant.core.function
Out[2]: <module 'diofant.core.function' from
'/home/sk/src/diofant/diofant/core/function.py'>

Closes sympy/sympy#12115

skirpichev/omg,diofant/diofant