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Proof step 6 from proof is_valid_ref-void (previous step)

st[r -- _type] = typeval(void_type), is_valid_ref(r, st) ⊦ r = jvmref, (¬ class+∃(str, void_type .class) ∨ is_abstract(void_type .class) ∨ ¬ is_obj(r, st)) ∧ ¬ ( type∃(str, st[r -- _type] .type) ∧ st[r -- _type] .type .jtelemtype ≠ void_type ∧ st[r -- _type] .type .jtelemtype ≠ abstract_type ∧ is_array(r, st))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
⊦ st[r -- _type] = typeval(void_type) ∧ r ≠ jvmref → ¬ is_obj(r, st)
Proof step 5:
⊦ is_array(r, st) → is_valid_ref(r, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ void_type ≠ abstract_type], [CSIMPSEQ : ⊦ void_type .jtelemtype = void_type], [CSIMPSEQ : ⊦ typeval(ty) .type = ty])]]