Rollup of 7 pull requests#80510

Merged

bors merged 16 commits intorust-lang:masterfrom

JohnTitor:rollup-gow7y0l

Dec 30, 2020

Commits on Dec 21, 2020

slightly more typed interface to panic implementation
RalfJung
committed

Commits on Dec 22, 2020

update a seemingly outdated comment
RalfJung
committed

Commits on Dec 25, 2020

fix another comment, and make __rust_start_panic code a bit more semantically clear
RalfJung
committed

Commits on Dec 26, 2020

Revert "Cleanup markdown span handling"

Joshua Nelson
authored and
jyn514
committed

Commits on Dec 28, 2020

Improvements to NatVis support
sivadeilra
committed

Commits on Dec 30, 2020