Fix zero-size uninitialized boxes#65174

Merged

bors merged 3 commits intorust-lang:masterfrom

SimonSapin:zero-box

Oct 19, 2019

Commits on Oct 6, 2019

Fix zero-size uninitialized boxes
SimonSapin
committed

Commits on Oct 16, 2019

Uninitialized boxes: check for zero-size allocation based on Layout::size
SimonSapin
committed

Commits on Oct 18, 2019

Uninitialized boxes: add test for zero-size allocations
SimonSapin
committed