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Given the code relies it for soundn= ess. >> You're either sure that it won't happen, then you use `debug_assert!`, o= r you >> are not sure, and use `assert!`. >> >> There's no "I am fairly certain but the code should keep running despite >> invariance violation" for this one. > > [ I keep getting your emails way later than they appear in the list... > I spotted this one as well in the mailing list. ] If you're using gmail, you might be hitting the receive limit? You can rece= ive at most 60 emails per minute. If you have more emails then it'll bounce. My email provider will retry aft= er 15 minutes for up to 6 times, so if you're consistently hitting the receive li= mit, then it might take up to 1.5 hr for you to receive my email (or for me to receive a delivery failure notification). Best, Gary