make `Instant::{duration_since, elapsed, sub}` saturating and remove workarounds#89926

Merged

bors merged 4 commits intorust-lang:masterfrom the8472:saturate-instant

Feb 13, 2022

+57-267

Commits on Feb 13, 2022

make Instant::{duration_since, elapsed, sub} saturating and remove workarounds
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Add caveat about the monotonicity guarantee by linking to the later section
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Add panic docs describing old, current and possible future behavior
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Capitalize "Rust"

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