New issue 2168: ValueError: binary mode doesn't take an errors argument
https://bitbucket.org/pypy/pypy/issues/2168/valueerror-binary-mode-doesnt-take-an
falsetru:
ValueError message mismatch.
In CPython 2.7:
```
#!python
>>> import io
>>> io.open('/tmp/test.txt', 'wb', encoding='utf-8')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: binary mode doesn't take an encoding argument
```
In Pypy 2.6.1:
```
#!python
>>>> import io
>>>> io.open('/tmp/test.txt', 'wb', encoding='utf-8')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: binary mode doesn't take an errors argument
```
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