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Proof step 7 from proof validrefnotnull-put-statfield (previous step)

validref(str, r, ty1, st) ⊦ r = jvmref, r = jvmref ∨ (st[jvmref -- sk, val][r -- _type]) .type ≤ ty1 ∧ ¬ junkref(str, r, st[jvmref -- sk, val])

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 5:
⊦ validref(str, r, ty, st) ↔ r = jvmref ∨ st[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st)
Proof step 6:
⊦ junkref(str, r, st[jvmref -- sk, val]) → junkref(str, r, st)

Rule argument

[crewrite-arg: validref-def, F, [st, ty, r, str] → [st, ty1, r, str]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ r ≠ r0 → (st[r0 -- sk0, val][r -- sk]) = st[r -- sk]])], [EXTRATERMS : (st, ty1, r, str)]]