Allow debug_stream to be optionally set in CompletionFinder.__call__(). By default, this is still set to os.fdopen(9), but now it can be overridden to a different i/o stream instead. May be useful for unit tests, especially as os.fdopen(9) is likely to conflict with pytest plugins and lead to obscure errors (which was happening in the pytest suite for ipython/traitlets#811).
Allow
debug_streamto be optionally set inCompletionFinder.__call__(). By default, this is still set toos.fdopen(9), but now it can be overridden to a different i/o stream instead. May be useful for unit tests, especially asos.fdopen(9)is likely to conflict with pytest plugins and lead to obscure errors (which was happening in the pytest suite for ipython/traitlets#811).Closes #393