[issue39027] run_coroutine_threadsafe uses wrong TimeoutError

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

futures._chain_future() should convert exceptions.
Seems _convert_future_exc() does this work already but maybe it fails somehow.
We need to investigate more.

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nosy: +asvetlov

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39027>
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