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Proof step 5 from proof junkrefs-put-notin-butlast (previous step)

fs = mkfs(class, ty0, fieldvar), r -- fs ' ∈ st, okval(st[r -- fs '], ty0), okval(val, ty0), r ∈ st, st[r -- _type] .type ≤ ty ⊦ r = jvmref, fs ' = _type, fs ' = _length, ¬ is_valid_ref(str, r, st[r -- fs ', val]) ↔ ¬ is_valid_ref(str, r, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
r -- mkfs(class, ty0, fieldvar) ' ∈ st, okval(st[r -- mkfs(class, ty0, fieldvar) '], ty0), okval(val, ty0), r ∈ st, st[r -- _type] .type ≤ ty ⊦ r = jvmref, mkfs(class, ty0, fieldvar) ' = _type, mkfs(class, ty0, fieldvar) ' = _length, ¬ is_valid_ref(str, r, st[r -- mkfs(class, ty0, fieldvar) ', val]) ↔ ¬ is_valid_ref(str, r, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]