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

validref(str, r, ty, st), is_referencevalue(val) → validref(str, val .refval, ty0, st) ∧ is_reftype(ty0), ¬ is_referencevalue(val) → okval(val, ty0) ∧ ty0 ≠ void_type ∧ mkfs(class, ty0, fieldvar) ' ≠ _length ⊦ validref(str, r, ty, st[r0 -- mkfs(class, ty0, fieldvar) ', val]), is_referencevalue(val) ∧ validref(str, val .refval, ty0, st) ∧ is_reftype(ty0), ¬ is_referencevalue(val) ∧ okval(val, ty0) ∧ ty0 ≠ void_type ∧ mkfs(class, ty0, fieldvar) ' ≠ _length

User applied rule cut formula

And closed the goal!

Rule argument

[fma-arg: is_referencevalue(val)]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRAFMAS : (is_referencevalue(val))]]