Backport accepted PRs to beta #26161
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Debug overflow checks for arithmetic negation landed in rust-lang#24500, at which time the `abs` method on signed integers was changed to using `wrapping_neg` to ensure that the function never panicked. This implied that `abs` of `INT_MIN` would return `INT_MIN`, another negative value. When this change was back-ported to beta, however, in rust-lang#24708, the `wrapping_neg` function had not yet been backported, so the implementation was changed in rust-lang#24785 to `!self + 1`. This change had the unintended side effect of enabling debug overflow checks for the `abs` function. Consequently, the current state of affairs is that the beta branch checks for overflow in debug mode for `abs` and the nightly branch does not. This commit alters the behavior of nightly to have `abs` always check for overflow in debug mode. This change is more consistent with the way the standard library treats overflow as well, and it is also not a breaking change as it's what the beta branch currently does (albeit if by accident). cc rust-lang#25378
The method was stabilized but the structure was forgotten to be stabilized. Closes rust-lang#25480
This iterator was mistakenly not reexported at the top level, preventing actually naming the type! Closes rust-lang#25519
Use a struct called Hole that keeps track of an invalid location in the vector and fills the hole on drop. I include a run-pass test that the current BinaryHeap fails, and the new one passes. Fixes rust-lang#25842
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r? @pcwalton (rust_highfive has picked a reviewer for you, use r? to override) |
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r? @brson |
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Added in #25821 as well |
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This is a backport of the following PRs (note the target of the beta branch)