view .arcconfig @ 37669:1cb54e6193a6

py3: paper over differences in future exception handling

It looks like Python 3's futures library lacks set_exception_info
entirely. We'll just give up and use set_exception in that case.

# no-check-commit because the underbar naming is just saner here

Differential Revision: https://phab.mercurial-scm.org/D3336

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