12050.pp

#include b  # works
include c  # 'broken', shows warning

define a($x) {
  exec { "A-$x":
    command => "/bin/echo $x",
  }

  if $require {
    Exec["A-$x"] { require +> $require }
  }
}

class b {
  a { "define_something":
    x => "foo",
    # no require specified here
  }
}

class d {
  notify { "d": }
}

class c {
  class { "d": }

  class { "b":
    require => Class["d"],
  }
}