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Proof step 22 from proof fits-superset (previous step)

r -- _type ∈ st ∧ st ⊆ st0, st[r -- sk] = refval(r0), 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, ∀ st, st0, r, str. st ⊆ st0 ∧ fits(r, sks0, st) → junkref(str, r, st) ∨ fits(r, sks0, st0) ⊦ r = jvmref, junkref(str, r, st), (is_classtype(st[r -- _type] .type) → sk ∈ instfields(st[r -- _type] .type .class)) ∧ (is_arraytype(st[r -- _type] .type) → ¬ is_fskey(sk) ∧ ¬ sk .index < 0 ∧ ¬ st0[r -- _length] .intval ≤ sk .index) ∧ fits(r0, sks0, st0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ is_classtype(ty) → ¬ is_arraytype(ty)])]]