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Proof step 29 from proof unchanged-rec-generic (previous step)

sk .fs = mkfs(class, ty, fieldvar), st[r -- sk] = refval(r0), unchanged(str, r, st, st0), is_arraytype(st[r -- _type] .type) → is_indexkey(sk) ∧ 0 ≤ sk .index ∧ sk .index < st[r -- _length] .intval, is_classtype(st[r -- _type] .type) → sk ∈ instfields(st[r -- _type] .type .class) ⊦ r = jvmref, junkref(str, r, st), unchanged(str, r0, st, st0), sk ∈ instfields(st[r -- _type] .type .class) ∧ is_obj(str, r, st) ∧ (r0 ≠ jvmref → st[r0 -- _type] .type ≤ ty ∧ is_valid_ref(str, r0, st))

User applied rule cut formula

And obtained the following new goals

Rule argument

[fma-arg: is_classtype(st[r -- _type] .type)]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRAFMAS : (is_classtype(st[r -- _type] .type))]]