tree 543f2944b9c7dcc262b0036420d3a04d64f93966
parent 98126cf9aeda4c715e07502cbda5fb3d62f73a02
author Nate Bosch <nbosch1@gmail.com> 1523999610 -0700
committer GitHub <noreply@github.com> 1523999610 -0700

Upgrade some hints to errors (dart-lang/stream_channel#19)

These prevent building internally. Fix an unused import.