(header ((h) ihello provides) ((sut) hello_complete_action component) ((w) ihello requires))
<external>.h.hello -> ...
... -> sut.h.hello
sut.w.hello -> ...
... -> <external>.w.hello
... <- <external>.w.cruel
sut.<q> <- ...
... <- <external>.w.return
sut.w.return <- ...
... <- sut.<q>
sut.w.cruel <- ...
... <- sut.h.cruel
<external>.h.cruel <- ...
... <- sut.h.return
<external>.h.return <- ...
(trail "h.hello" "w.hello" "w.cruel" "w.return" "h.cruel" "h.return")
(labels "h.hello" "w.cruel" "w.world")
(eligible "h.hello")
