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Proof step 8 from proof validrefnotnull-is-junk (conclusion)

⊦ r = jvmref ∨ ¬ is_valid_ref(str, r, st) ∨ ¬ st[r -- _type] .type ≤ ty ∧ ¬ type∃(str, st[r -- _type] .type) → ¬ validrefnotnull(str, r, ty, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 1:
⊦ ¬ validrefnotnull(str, jvmref, ty, st)
Proof step 2:
⊦ validrefnotnull(str, r, ty, st) → r ≠ jvmref
Proof step 7:
validrefnotnull(str, r, ty, st), ¬ st[r -- _type] .type ≤ ty ∧ ¬ type∃(str, st[r -- _type] .type) ∨ ¬ is_valid_ref(str, r, st) ⊦ r = jvmref

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]