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Proof step 4 from proof is_valid_ref-field-in (previous step)

sk ∈ instfields(class), st[r -- _type] .type ≤ mkclasstype(class), is_valid_ref(r, st) ⊦ ¬ class+∃(str, st[r -- _type] .type .class) ∨ is_abstract(st[r -- _type] .type .class) ∨ ¬ is_obj(r, st), r = jvmref, r -- sk ∈ st

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ ¬ r -- sk ∈ st ∧ sk ∈ instfields(class) ∧ st[r -- _type] .type ≤ mkclasstype(class) ∧ r ≠ jvmref → ¬ is_obj(r, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]