Rollup of 9 pull requests#86456

Merged

bors merged 18 commits intorust-lang:masterfrom

JohnTitor:rollup-jjzupny

Jun 19, 2021

Commits on Jun 8, 2021

Stabilize span_open() and span_close().
m-ou-se
committed

Commits on Jun 16, 2021

Use as_secs_f64 in JunitFormatter
fee1-dead
committed

Commits on Jun 17, 2021

Fix rustdoc stabilized versions layout
Matteo Briani
committed
Alter std::cell::Cell::get_mut documentation
Eosis
committed
Use `map_or` instead of open-coding it
LingMan
committed

Commits on Jun 18, 2021

Commits on Jun 19, 2021