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Proof step 11 from proof junkref-put-badfield (previous step)

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

User applied rule exists right

And obtained the following new goals

Proof step 10:
junkrefs(str, r0 ' + refs0, val .type, st[r0 -- _type, val]), junkrefs(str, r0 ' + refs0, val .type, st) ⊦ is_typevalue(st[r0 -- _type]) ∧ is_reftype(st[r0 -- _type] .type), r0 ' + refs0 ≠ [] ∧ (r0 ' + refs0) .first = r0 ∧ junkrefs(str, r0 ' + refs0, st[(r0 ' + refs0) .first -- _type] .type, st)

Rule argument

[EXRARG : pos: right 2, [extquanttermlist: (r0 ' + refs0) abort:F , discard:T , computed:F ]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (r0 ' + refs0)]]