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Proof step 53 from proof validrefnotnull-union-at-right (previous step)

ty = mkclasstype(class), validrefnotnull(str, r, ty, st0), is_classtype(ty), 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 52:
validrefnotnull(str, r, mkclasstype(class), st0), sk ∈ instfields(class), is_fskey(sk) ⊦ (st ∪ st0)[r -- sk] = st0[r -- sk], r = jvmref

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ is_classtype(mkclasstype(class))])]]