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Proof step 22 from proof isvalidref-put-array-badindex (previous step)

¬ r ≠ r0, i < 0 ⊦ is_valid_ref(r0, st[r -- i ', val]) ∧ (class+∃(str, st[r0 -- _type] .type .class) ∧ ¬ is_abstract(st[r0 -- _type] .type .class) ∧ is_obj(r0, st) ∨ is_array(str, r0, st[r -- i ', val])) ↔ is_obj(str, r0, st) ∨ is_array(str, r0, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 21:
i < 0 ⊦ is_valid_ref(r0, st[r0 -- i ', val]) ∧ ( class+∃(str, st[r0 -- _type] .type .class) ∧ ¬ is_abstract(st[r0 -- _type] .type .class) ∧ is_obj(r0, st) ∨ is_array(str, r0, st[r0 -- i ', val])) ↔ is_obj(str, r0, st) ∨ is_array(str, r0, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]