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Proof step 124 from proof validrefs-lastelem (previous step)

validrefs(str, refs, ty, st), validrefs(str, refs + r ', ty, st) ⊦ refs = [], has_reffield(refs .last, st)

User applied rule structural induction

And obtained the following new goals

Proof step 123:
∀ str, ty, st, r. validrefs(str, acc, ty, st) ∧ validrefs(str, acc + r ', ty, st) → acc = [] ∨ has_reffield(acc .last, st), validrefs(str, r0 + acc, ty, st), validrefs(str, (r0 + acc) + r ', ty, st) ⊦ r0 + acc = [], has_reffield((r0 + acc) .last, st)

Rule argument

[VARWITHVARSEQSARG : refs, ()]

Additional information

[[CONCRETESIMPRULES : ([CSIMPGEN : references generated by [], +;])]]