Merge pull request #20628 from stephentoub/asyncinterfaces
authorStephen Toub <stoub@microsoft.com>
Fri, 26 Oct 2018 15:26:10 +0000 (08:26 -0700)
committerGitHub <noreply@github.com>
Fri, 26 Oct 2018 15:26:10 +0000 (08:26 -0700)
Add interfaces/helper types for async iterators


Trivial merge