Backport Sender::is_closed method #1252
Merged
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This PR backports #836 to 0.1. Note that in 99416a (v0.1), a function called
is_closedis implemented forStatewhich also checksself.num_messagesand does not exist onmaster. This is confusing. I don't know enough about the internals ofmpscto know which one is correct (and whether we also need to checknum_messagesonmaster).