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Proof step 4 from proof validref-class-rec (previous step)

st[r -- mkfs(class, ty0, fieldvar) '] = refval(r0), st[r -- _type] .type ≤ ty, is_obj(str, r, st), mkfs(class, ty0, fieldvar) ' ∈ instfields(st[r -- _type] .type .class), st[r0 -- _type] .type ≤ ty0 ⊦ r = jvmref, r0 = jvmref, junkref(str, r0, st), validref(str, r0, ty0, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ validref(str, r, ty, st) ↔ r = jvmref ∨ st[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st)

Rule argument

[crewrite-arg: validref-def, F, [st, ty, r, str] → [st, ty0, r0, str]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, ty0, r0, str)]]