Collection-based dependencies

deps.pp

define echo {
  exec { "echo-$name":
    command => "/usr/bin/echo $name"
  }
}

Foo <| color == 'green' |> -> echo { "yo": } -> Foo <| color == 'red' |>

define foo($color) {
  notice("foo[$name]: $color")
  echo { "foo-$name-$color": }
}

foo { r1: color => red }
foo { g1: color => green }
foo { g2: color => green }
foo { r2: color => red }