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Proof step 7 from proof okbar-nopath (previous step)

refs0 = r0 + refs, r0 = st[r -- i '] .refval, is_array(str, r, st), okbytearray(r, st), i < st[r -- _length] .intval, is_referencevalue(st[r -- i ']), validrefs(str, refs0, st[r -- _type] .type .type, st), 0 ≤ i, 0 < st[r -- _length] .intval ⊦ refs0 = [], r = refs0 .last

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
0 ≤ i, 0 < st[r -- _length] .intval, is_array(str, r, st), okbytearray(r, st), i < st[r -- _length] .intval, is_referencevalue(st[r -- i ']), validrefs(str, st[r -- i '] .refval ' + refs, st[r -- _type] .type .type, st) ⊦ r = (st[r -- i '] .refval ' + refs) .last

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ (refs + refs0) + refs1 = refs + refs0 + refs1], [CSIMPSEQ : ⊦ r ' + refs ≠ []], [CSIMPSEQ : ⊦ r + refs = r ' + refs])]]