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Proof step 29 from proof validrefnotnull-union-at-right (previous step)

st0[r -- _type] .type = mkclasstype(class0), mkfs(class1, ty, fieldvar) ' ∈ instfields(class), class0 ≤ class ⊦ r = jvmref, st[r -- mkfs(class1, ty, fieldvar) '] = noval, junkref(str, r, st0), r -- mkfs(class1, ty, fieldvar) ' ∈ st0, (is_reftype(ty) ∨ ty = abstract_type) ∧ noval .refval ≠ jvmref

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 10:
⊦ r ≠ jvmref ∧ ¬ is_valid_ref(str, r, st) → junkref(str, r, st)
Proof step 28:
¬ (r ≠ jvmref ∧ ¬ is_valid_ref(str, r, st0)), st0[r -- _type] .type = mkclasstype(class0), mkfs(class1, ty, fieldvar) ' ∈ instfields(class), class0 ≤ class ⊦ r = jvmref, st[r -- mkfs(class1, ty, fieldvar) '] = noval, junkref(str, r, st0), r -- mkfs(class1, ty, fieldvar) ' ∈ st0, (is_reftype(ty) ∨ ty = abstract_type) ∧ noval .refval ≠ jvmref

Rule argument

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

Additional information

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