Merge branch 'master' into 'master'

.gitlab-ci.yml

Cargo.toml

benches/mpsc.rs

benches/sbrk.rs

benches/vec.rs

rustfmt.toml

src/allocator.rs

src/block.rs

src/bookkeeper.rs

src/brk.rs

src/cell.rs

src/fail.rs

src/lib.rs

src/log.rs

src/prelude.rs

src/ptr.rs

src/sync.rs

src/tls.rs

src/vec.rs

tests/arc.rs