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Proof step 13 from proof validref-forward (previous step)

st0[r -- mkfs(class0, ty, fieldvar) '] = refval(r0), is_reftype(ty), mkfs(class0, ty, fieldvar) ' ∈ instfields(class), st0[r -- _type] .type ≤ mkclasstype(class) ⊦ r = jvmref, r0 = jvmref, junkref(str, r, st0), st0[r0 -- _type] .type ≤ ty ∧ ¬ junkref(str, r0, st0)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ r ≠ jvmref ∧ ¬ is_valid_ref(str, r, st) → junkref(str, r, st)
Proof step 12:
¬ (r ≠ jvmref ∧ ¬ is_valid_ref(str, r, st0)), st0[r -- mkfs(class0, ty, fieldvar) '] = refval(r0), is_reftype(ty), mkfs(class0, ty, fieldvar) ' ∈ instfields(class), st0[r -- _type] .type ≤ mkclasstype(class) ⊦ r = jvmref, r0 = jvmref, junkref(str, r, st0), st0[r0 -- _type] .type ≤ ty ∧ ¬ junkref(str, r0, st0)

Rule argument

[crewrite-arg: junkref-is-junk, F, [st, r, str] → [st0, r, str]]

Additional information

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