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Proof step 20 from proof junkref-put-refval (previous step)

is_reftype(ty0), ty ≤ ty0, validref(str, r1, ty, st), junkref(str, r, st[r0 -- mkfs(class, ty0, fieldvar) ', refval(r1)]) ⊦ junkref(str, r, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ validref(str, r, ty, st) ↔ r = jvmref ∨ st[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st)
Proof step 19:
is_reftype(ty0), ty ≤ ty0, r1 = jvmref ∨ st[r1 -- _type] .type ≤ ty ∧ ¬ junkref(str, r1, st), junkref(str, r, st[r0 -- mkfs(class, ty0, fieldvar) ', refval(r1)]) ⊦ junkref(str, r, st)

Rule argument

[crewrite-arg: validref-def, F, [st, ty, r, str] → [st, ty, r1, str]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, ty, r1, str)]]