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Proof step 19 from proof junkref-put-nopathex-equiv-01 (previous step)

is_valid_ref(str, r0, st), junkrefs(str, r ' + refs0, st[r -- _type] .type, st) ⊦ sk = _type, path∃(str, r, r0, st), ∃ refs. refs ≠ [] ∧ refs .first = r ∧ junkrefs(str, refs, st[refs .first -- _type] .type, st[r0 -- sk, val])

User applied rule exists right

And obtained the following new goals

Rule argument

[EXRARG : pos: right 3, [extquanttermlist: (r ' + refs0) abort:F , discard:T , computed:F ]]

Additional information

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