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Proof step 81 from proof maxpath-object (previous step)

st[r -- fs '] = refval(r0), fs ' ∈ instfields(st[r -- _type] .type .class), is_obj(str, r, st), validrefs(str, r ' + refs0, st[r -- _type] .type, st), ∀ refs. ¬ refs ∈ validrefset(str, r, st) ⊦ junkref(str, r, st), cyclic(str, r, st), has_reffield((r ' + refs0) .last, st), dups(refs0), r ∈ refs0

User applied rule all left

And obtained the following new goals

Proof step 80:
st[r -- fs '] = refval(r0), fs ' ∈ instfields(st[r -- _type] .type .class), is_obj(str, r, st), validrefs(str, r ' + refs0, st[r -- _type] .type, st), ¬ r ' + refs0 ∈ validrefset(str, r, st) ⊦ junkref(str, r, st), cyclic(str, r, st), has_reffield((r ' + refs0) .last, st), dups(refs0), r ∈ refs0

Rule argument

[EXRARG : pos: left 5, [extquanttermlist: (r ' + refs0) abort:F , discard:T , computed:F ]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (r ' + refs0)]]