| ⊦ ¬ path∃(str, r, r0, st) ∧ sk ≠ _type ∧ is_valid_ref(str, r0, st) → (junkref(str, r, st[r0 -- sk, val]) ↔ junkref(str, r, st)) |
is_valid_ref(str, r0, st) ⊦ sk = _type, junkref(str, r, st[r0 -- sk, val]) ↔ junkref(str, r, st), path∃(str, r, r0, st)
[[CONCRETESIMPRULES : ()]]