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Proof step 8 from proof is_valid_ref-void (conclusion)

⊦ st[r -- _type] = typeval(void_type) ∧ r ≠ jvmref → ¬ is_valid_ref(str, r, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 1:
⊦ is_valid_ref(str, r, st) ↔ ¬ ¬ (is_valid_ref(r, st) ∧ (is_obj(str, r, st) ∨ is_array(str, r, st)))
Proof step 2:
⊦ is_obj(str, r, st) ↔ class+∃(str, st[r -- _type] .type .class) ∧ ¬ is_abstract(st[r -- _type] .type .class) ∧ is_obj(r, st)
Proof step 7:
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)) ∧ ¬ is_array(str, r, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ typeval(ty) .type = ty])]]