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Proof step 15 from proof fits-superset (previous step)

st[r -- sk] = refval(r0), r -- _type ∈ st, r ∈ st, sk ∈ instfields(st[r -- _type] .type .class), is_classtype(st[r -- _type] .type), fits(r0, sks0, st), st ⊆ st0, is_obj(str, r, st), r -- sk ∈ st, junkref(str, r0, st), is_fskey(sk) ⊦ r = jvmref, fits(r0, sks0, st0), ∃ fs. fs ' ∈ instfields(st[r -- _type] .type .class) ∧ is_referencevalue(st[r -- fs ']) ∧ st[r -- fs '] .refval ≠ jvmref ∧ (¬ st[st[r -- fs '] .refval -- _type] .type ≤ fs .type ∨ junkref(str, st[r -- fs '] .refval, st))

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 11:
⊦ is_fskey(sk) ↔ (∃ fs. sk = fs ')
Proof step 14:
st[r -- sk] = refval(r0), r -- _type ∈ st, r ∈ st, sk ∈ instfields(st[r -- _type] .type .class), is_classtype(st[r -- _type] .type), fits(r0, sks0, st), st ⊆ st0, is_obj(str, r, st), r -- sk ∈ st, junkref(str, r0, st), ∃ fs. sk = fs ' ⊦ r = jvmref, fits(r0, sks0, st0), ∃ fs. fs ' ∈ instfields(st[r -- _type] .type .class) ∧ is_referencevalue(st[r -- fs ']) ∧ st[r -- fs '] .refval ≠ jvmref ∧ (¬ st[st[r -- fs '] .refval -- _type] .type ≤ fs .type ∨ junkref(str, st[r -- fs '] .refval, st))

Rule argument

[speclemmaarg: ,is_fskey(sk) ↔ (∃ fs. sk = fs ') ,[sk] → [sk] ,F ,storekey , ,ex-03 ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (sk)]]