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Proof step 51 from proof validrefnotnull-union-at-right (previous step)

¬ r -- sk ∈ st0, validrefnotnull(str, r, mkclasstype(class), st0), sk ∈ instfields(class), is_fskey(sk) ⊦ (st ∪ st0)[r -- sk] = st0[r -- sk], r = jvmref

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 50:
validrefnotnull(str, r, mkclasstype(class), st0), sk ∈ instfields(class), is_fskey(sk) ⊦ r = jvmref, st[r -- sk] = noval, r -- sk ∈ st0

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ∅[rk] = noval], [CSIMPSEQ : ⊦ ¬ rk ∈ st → st[rk] = ∅[rk]], [CSIMPSEQ : ⊦ ¬ rk ∈ st0 → (st ∪ st0)[rk] = st[rk]])]]