Example doesn't compile: Divergent implicit

I extracted the swagger example in its own Sbt project and I get the following compilation error:

info] Compiling 4 Scala sources to /Users/dragos/sandbox/rho-example/target/scala-2.12/classes...
[error] /Users/dragos/sandbox/rho-example/src/main/scala/com/http4s/rho/swagger/demo/MyService.scala:32: diverging implicit expansion for type org.http4s.rho.bits.HListToFunc[shapeless.HNil,fs2.Task[com.http4s.rho.swagger.demo.MyService.TemporaryRedirect.T]]
[error] starting with value serverSentEventEncoder in trait EntityEncoderInstances
[error]     GET |>> TemporaryRedirect(Uri(path="/swagger-ui"))
[error]         ^
[error] one error found
[error] (compile:compileIncremental) Compilation failed
[error] Total time: 7 s, completed Oct 4, 2017 6:17:19 PM

I used the following build file, and the files under src/main/scala are exactly the files in the rho-examples/../swagger:

scalaVersion := "2.12.3"

name := "rho-example"

resolvers += Resolver.sonatypeRepo("snapshots")

val http4sVersion = "0.17.1"

libraryDependencies ++= Seq(
  "org.http4s" %% "rho-swagger" % "0.17.1-SNAPSHOT",
  "org.http4s" %% "http4s-blaze-server"   % http4sVersion,
  "org.http4s" %% "http4s-dsl"            % http4sVersion,
  "org.json4s" %% "json4s-ext"            % "3.5.3"
)

http4s / rho

Example doesn't compile: Divergent implicit #191