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Proof step 3 from proof fits-pathex (previous step)

st[r -- sks] .refval = refs .last, validrefs(str, r ' + refs, st[r -- _type] .type, st), fits(r, sks, st) ⊦ refs = [], junkref(str, r, st), path∃(str, r, refs .last, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

[speclemmaarg: , ¬ path∃(str, r, r0, st) ∧ r0 ∈ refs → ¬ validrefs(str, r ' + refs, ty, st) ,[str, r, r0, st, refs, ty] → [str, r, refs .last, st, refs, st[r -- _type] .type] ,F ,cyclic , ,validrefs-nopathex ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ refs .last ∈ refs ↔ refs ≠ []])], [EXTRATERMS : (str, r, refs .last, st, refs, st[r -- _type] .type)]]