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Proof step 9 from proof validrefkeynotnull-has-field (previous step)

st[rk] = refval(r), rk ∈ st, sk ∈ instfields(class), is_fskey(sk), st[r -- _type] .type ≤ mkclasstype(class) ⊦ r = jvmref, r -- sk ∈ st, junkref(str, r, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 7:
⊦ r ≠ jvmref ∧ ¬ is_valid_ref(str, r, st) → junkref(str, r, st)
Proof step 8:
¬ (r ≠ jvmref ∧ ¬ is_valid_ref(str, r, st)), st[rk] = refval(r), rk ∈ st, sk ∈ instfields(class), is_fskey(sk), st[r -- _type] .type ≤ mkclasstype(class) ⊦ r = jvmref, r -- sk ∈ st, junkref(str, r, st)

Rule argument

[crewrite-arg: junkref-is-junk, F, [st, r, str] → [st, r, str]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, r, str)]]