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Another issue is that with the patch applied help() is broken for certain forms
of docstrings:
from decimal import *
>>> print(setcontext.__doc__)
setcontext(c) - Set a new default context.
>>> help(setcontext)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/home/stefan/hg/cpython/Lib/_sitebuiltins.py", line 99, in __call__
 return pydoc.help(*args, **kwds)
 File "/home/stefan/hg/cpython/Lib/pydoc.py", line 1792, in __call__
 self.help(request)
 File "/home/stefan/hg/cpython/Lib/pydoc.py", line 1842, in help
 else: doc(request, 'Help on %s:', output=self._output)
 File "/home/stefan/hg/cpython/Lib/pydoc.py", line 1578, in doc
 pager(render_doc(thing, title, forceload))
 File "/home/stefan/hg/cpython/Lib/pydoc.py", line 1571, in render_doc
 return title % desc + '\n\n' + renderer.document(object, name)
 File "/home/stefan/hg/cpython/Lib/pydoc.py", line 358, in document
 if inspect.isroutine(object): return self.docroutine(*args)
 File "/home/stefan/hg/cpython/Lib/pydoc.py", line 1323, in docroutine
 signature = inspect.signature(object)
 File "/home/stefan/hg/cpython/Lib/inspect.py", line 1551, in signature
 raise ValueError(msg)
ValueError: no signature found for builtin function <built-in function setcontext>
Perhaps this form of docstrings is discouraged (I used it because it looks nice
in pydoc), but nevertheless it might be present in third party modules.