Rollup of 7 pull requests#60001

Closed

Centril wants to merge 20 commits intorust-lang:masterfrom

Centril:rollup-tq1rzfl

Commits on Apr 5, 2019

improve docs for std::hint::unreachable_unchecked()
Unreachable
committed
Remove parens
Unreachable
committed

Commits on Apr 12, 2019

Continue evaluating after missing main
estebank
committed

Commits on Apr 14, 2019

Limit dylib symbols
Zoxc
committed

Commits on Apr 15, 2019