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Proof step 15 from proof validref-put-badfield (conclusion)

⊦ validref(str, r, ty, st) ∧ ¬ (is_typevalue(st[r0 -- _type]) ∧ is_reftype(st[r0 -- _type] .type)) → validref(str, r, ty, st[r0 -- fs ', val])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 14:
validref(str, r, ty, st) ⊦ validref(str, r, ty, st[r0 -- fs ', val]), is_typevalue(st[r0 -- _type]) ∧ is_reftype(st[r0 -- _type] .type)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]