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Proof step 60 from proof maxpath-object (previous step)

maxpath(str, r0, st) = # refs0, st[r -- fs '] = refval(r0), maxpath(str, r, st) = 2 + # refs, refs0 ∈ validrefset(str, r0, st), maxpath(str, r, st) ≤ maxpath(str, r0, st), validrefs(str, r ' + refs + r1 ', st[r -- _type] .type, st), fs ' ∈ instfields(st[r -- _type] .type .class), is_obj(str, r, st), # refs + 1 < maxpath(str, r0, st) ⊦ validrefset(str, r, st) = ∅, # validrefset(str, r, st) = 0, r = r1, validrefset(str, r0, st) = ∅, # validrefset(str, r0, st) = 0, junkref(str, r, st), cyclic(str, r, st), has_reffield(r1, st), r ∈ refs, r1 ∈ refs, dups(refs)

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

[crewrite-arg: validrefset-def , F , [st, r, str, refs] → [st, r0, str, refs0] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, r0, str, refs0)]]