Move Duration to libcore (and remove deprecated Duration::span)#30594

Closed

SimonSapin wants to merge 3 commits intorust-lang:masterfrom

SimonSapin:core-duration

Commits on Dec 30, 2015

Commits on Jan 1, 2016

Make core::time unstable (but keep the std::time::Duration reexport stable)
SimonSapin
committed