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Proof step 4 from proof validrefval-union (previous step)

validref(str, r, ty, st) ⊦ validref(str, r, ty, st0 ∪ st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ validref(str, r, ty, st) → validref(str, r, ty, st0 ∪ st)

Rule argument

[crewrite-arg: validref-union , F , [st, st0, ty, r, str] → [st, st0, ty, r, str] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, st0, ty, r, str)]]