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Proof step 87 from proof maxpath-object (previous step)

validrefset(str, r, st) = ∅, st[r -- fs '] = refval(r0), fs ' ∈ instfields(st[r -- _type] .type .class), is_obj(str, r, st) ⊦ junkref(str, r, st), cyclic(str, r, st)

User applied rule insert spec-lemma

And obtained the following new goals

Proof step 76:
¬ junkref(str, r, st), ¬ cyclic(str, r, st) ⊦ ∃ refs. validrefs(str, refs, st[r -- _type] .type, st) ∧ refs ≠ [] ∧ ¬ dups(refs) ∧ refs .first = r ∧ ¬ has_reffield(refs .last, st)
Proof step 86:
∃ refs. validrefs(str, refs, st[r -- _type] .type, st) ∧ refs ≠ [] ∧ ¬ dups(refs) ∧ refs .first = r ∧ ¬ has_reffield(refs .last, st), validrefset(str, r, st) = ∅, st[r -- fs '] = refval(r0), fs ' ∈ instfields(st[r -- _type] .type .class), is_obj(str, r, st) ⊦ junkref(str, r, st), cyclic(str, r, st)

Rule argument

[speclemmaarg: ¬ junkref(str, r, st), ¬ cyclic(str, r, st) ,∃ refs. validrefs(str, refs, st[r -- _type] .type, st) ∧ refs ≠ [] ∧ ¬ dups(refs) ∧ refs .first = r ∧ ¬ has_reffield(refs .last, st) ,[str, r, st] → [str, r, st] ,F ,cyclic , ,exvalidrefs-maxlength ]

Additional information

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