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Proof step 9 from proof fits-subset (previous step)

st[r -- sk] = refval(r0), st0[r -- _type] .type = mkclasstype(class), r ∈ st0, sk ∈ instfields(class), fits(r0, sks0, st), st0 ⊆ st, is_obj(str, r, st0), r -- _type ∈ st0, ∀ st0, st, r, str. st0 ⊆ st ∧ fits(r, sks0, st) → junkref(str, r, st0) ∨ fits(r, sks0, st0) ⊦ r = jvmref, junkref(str, r, st0), r -- sk ∈ st0

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

[speclemmaarg: , ¬ r -- sk ∈ st ∧ sk ∈ instfields(st[r -- _type] .type .class) → ¬ is_obj(str, r, st) ,[r, sk, st, str] → [r, sk, st0, str] ,F ,addfuns , ,is_obj-notin-01 ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ mkclasstype(class) .class = class])], [EXTRATERMS : (r, sk, st0, str)]]