⊦ r -- sk ∈ st → r ∈ st
r -- sk ∈ st, r ∈ st, ∀ rk0. rk0 = _out ∨ rk0 ∈ st → rk0 .ref ≠ r ⊦ r = jvmref
[[CONCRETESIMPRULES : ()]]