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Proof step 7 from proof validref-not-junkrefs (previous step)

junkrefs(str, r ' + refs, ty, st), st[r -- _type] .type ≤ ty ⊦ r = jvmref, ∃ refs0. refs0 ≠ [] ∧ refs0 .first = r ∧ junkrefs(str, refs0, st[refs0 .first -- _type] .type, st)

User applied rule exists right

And obtained the following new goals

Proof step 6:
junkrefs(str, r ' + refs, ty, st), st[r -- _type] .type ≤ ty ⊦ r = jvmref, r ' + refs ≠ [] ∧ (r ' + refs) .first = r ∧ junkrefs(str, r ' + refs, st[(r ' + refs) .first -- _type] .type, st)

Rule argument

[EXRARG : pos: right 2, [extquanttermlist: (r ' + refs) abort:F , discard:T , computed:F ]]

Additional information

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