Test the various heuristics of erase_indices
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This is a targeted test to make sure we cover all the heuristic edge cases in `erase_indices`, used by `drain` and other methods. I found a failure from `cargo mutants` where we still passed tests after `erase_indices_sweep` was replaced with an empty body. I was concerned because that function contains `unsafe` code, so we *really* need it tested. It turns out that we do *sometimes* hit that in `quickcheck` tests, but might miss that if we're randomly unlucky, so this PR adds a new test that will hit all the edge cases every time.
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This is a targeted test to make sure we cover all the heuristic edge
cases in
erase_indices, used bydrainand other methods.I found a failure from
cargo mutantswhere we still passed tests aftererase_indices_sweepwas replaced with an empty body. I was concernedbecause that function contains
unsafecode, so we really need ittested. It turns out that we do sometimes hit that in
quickchecktests, but might miss that if we're randomly unlucky, so this PR adds a
new test that will hit all the edge cases every time.