BinaryHeap integer overflow with ZST?

[theemathas]

I found this comment in the standard library, indicating that BinaryHeap can have an integer overflow with a large collection of ZSTs. This should probably be fixed.

rust/library/alloc/src/collections/binary_heap/mod.rs

Lines 788 to 789 in 467250d

	// FIXME: 2 * hole.pos() + 1 or 2 * hole.pos() + 2 could overflow
	// if T is a ZST

[Saphereye]

@rustbot claim