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Proof step 13 from proof pathex-validrefs-in (previous step)

validrefs(str, r ' + refs1 + r0 ' + refs0, ty, st) ⊦ ∃ refs. refs ≠ [] ∧ refs .first = r ∧ refs .last = r0 ∧ validrefs(str, refs, mkclasstype(`java.lang.Object' .class), st)

User applied rule exists right

And obtained the following new goals

Proof step 12:
validrefs(str, r ' + refs1 + r0 ' + refs0, ty, st) ⊦ r ' + refs1 + r0 ' ≠ [] ∧ (r ' + refs1 + r0 ') .first = r ∧ (r ' + refs1 + r0 ') .last = r0 ∧ validrefs(str, r ' + refs1 + r0 ', mkclasstype(`java.lang.Object' .class), st)

Rule argument

[EXRARG : pos: right 1, [extquanttermlist: (r ' + refs1 + r0 ') abort:F , discard:T , computed:F ]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (r ' + refs1 + r0 ')]]