my rust fork
https://www.rust-lang.org
a4d9b4a6a2
These implementations of `abs_diff` were added in c2ff1b3119
("Completely overhaul fuzz testing"), but the signed implementation is
wrong when |x| + |y| exceeds the integer's limits (e.g.
`(-128).abs_diff(1)` should be 128 but currently these return 127.
Resolve this by just using `std`'s implementation since that is stable
now. This isn't used anywhere critical, we probably just weren't hitting
the edge case.
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