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Proof step 17 from proof validref-put-refval (conclusion)

⊦ validref(str, r, ty0, st) ∧ validref(str, r1, ty, st) ∧ ty ≤ fs .type ∧ is_reftype(fs .type) → validref(str, r, ty0, st[r0 -- fs ', refval(r1)])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 16:
is_reftype(fs .type), ty ≤ fs .type, validref(str, r1, ty, st), validref(str, r, ty0, st) ⊦ validref(str, r, ty0, st[r0 -- fs ', refval(r1)])

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]