Go get fails

[caledhwa]

go get github.com/cloudflare/logshare/... fails for me on my dev environment.

I have this version of Go:
go version go1.10.1 darwin/amd64

This is the output:

# golang.org/x/net/idna
../../../golang.org/x/net/idna/idna.go:118:41: undefined: bidirule.ValidString
../../../golang.org/x/net/idna/idna.go:260:19: undefined: bidirule.ValidString
../../../golang.org/x/net/idna/idna.go:268:19: undefined: bidirule.ValidString
../../../golang.org/x/net/idna/idna.go:277:20: undefined: bidirule.ValidString
../../../golang.org/x/net/idna/idna.go:338:47: multiple-value bidirule.DirectionString() in single-value context
../../../golang.org/x/net/idna/idna.go:397:35: multiple-value bidirule.DirectionString() in single-value context