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Proof step 7 from proof cyclic-put-badclassfield (previous step)

is_classtype(st[r0 -- _type] .type), validrefs(str, (r ' + refs0) + r1 ', st[r -- _type] .type, st[r0 -- fs ', val]) ⊦ fs ' = _type, junkref(str, r, st), fs ' ∈ instfields(st[r0 -- _type] .type .class), dups(refs0), r ∈ refs0, r1 ≠ r ∧ ¬ r1 ∈ refs0, ∃ refs, r2. ¬ dups(refs) ∧ r2 ∈ refs ∧ refs .first = r ∧ validrefs(str, refs + r2 ', st[refs .first -- _type] .type, st)

User applied rule exists right

And obtained the following new goals

Proof step 6:
is_classtype(st[r0 -- _type] .type), validrefs(str, (r ' + refs0) + r1 ', st[r -- _type] .type, st[r0 -- fs ', val]) ⊦ fs ' = _type, junkref(str, r, st), fs ' ∈ instfields(st[r0 -- _type] .type .class), dups(refs0), r ∈ refs0, r1 ≠ r ∧ ¬ r1 ∈ refs0, ¬ dups(r ' + refs0) ∧ r1 ∈ r ' + refs0 ∧ (r ' + refs0) .first = r ∧ validrefs(str, (r ' + refs0) + r1 ', st[(r ' + refs0) .first -- _type] .type, st)

Rule argument

[EXRARG : pos: right 7, [extquanttermlist: (r ' + refs0, r1) abort:F , discard:T , computed:F ]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (r ' + refs0, r1)]]