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Proof step 3 from proof validref-put-field-refval (previous step)

val = refval(r1), is_reftype(ty0), validref(str, r, ty, st), validref(str, r1, ty0, st), is_referencevalue(val) ⊦ validref(str, r, ty, st[r0 -- mkfs(class, ty0, fieldvar) ', val])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
is_reftype(ty0), validref(str, r, ty, st), validref(str, r1, ty0, st) ⊦ validref(str, r, ty, st[r0 -- mkfs(class, ty0, fieldvar) ', refval(r1)])

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ is_referencevalue(refval(r))])]]