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Proof step 6 from proof junkref-put-norefval-01 (previous step)

okval(val, ty), junkrefs(str, r ' + refs1, st[r -- _type] .type, st[r1 -- mkfs(class, ty, fieldvar) ', val]) ⊦ ty = void_type, mkfs(class, ty, fieldvar) ' = _length, is_referencevalue(val), ∃ refs. refs ≠ [] ∧ refs .first = r ∧ junkrefs(str, refs, st[refs .first -- _type] .type, st)

User applied rule exists right

And obtained the following new goals

Proof step 5:
okval(val, ty), junkrefs(str, r ' + refs1, st[r -- _type] .type, st[r1 -- mkfs(class, ty, fieldvar) ', val]) ⊦ ty = void_type, mkfs(class, ty, fieldvar) ' = _length, is_referencevalue(val), r ' + refs1 ≠ [] ∧ (r ' + refs1) .first = r ∧ junkrefs(str, r ' + refs1, st[(r ' + refs1) .first -- _type] .type, st)

Rule argument

[EXRARG : pos: right 4, [extquanttermlist: (r ' + refs1) abort:F , discard:T , computed:F ]]

Additional information

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