[master] Forward-ports from beta#56211

Merged

bors merged 3 commits intorust-lang:masterfrom

petrochenkov:fwd

Nov 25, 2018

Commits on Nov 25, 2018

resolve: Prohibit relative paths in visibilities on 2018 edition
petrochenkov
committed
resolve: Fix bad span arithmetics in import conflict diagnostics
petrochenkov
committed
resolve: Fix some more asserts in import validation
petrochenkov
committed