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Proof step 50 from proof validrefnotnull-union-at-right (previous step)

validrefnotnull(str, r, mkclasstype(class), st0), sk ∈ instfields(class), is_fskey(sk) ⊦ r = jvmref, st[r -- sk] = noval, r -- sk ∈ st0

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ validrefnotnull(str, r, ty, st) ↔ r ≠ jvmref ∧ validref(str, r, ty, st)
Proof step 49:
r ≠ jvmref ∧ validref(str, r, mkclasstype(class), st0), sk ∈ instfields(class), is_fskey(sk) ⊦ r = jvmref, st[r -- sk] = noval, r -- sk ∈ st0

Rule argument

[crewrite-arg: validrefnotnull-def , F , [st, ty, r, str] → [st0, mkclasstype(class), r, str] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st0, mkclasstype(class), r, str)]]