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Proof step 16 from proof pathex-junkref (previous step)

refs = r + refs0, junkref(str, refs .last, st), validrefs(str, refs, st[r -- _type] .type, st) ⊦ refs = [], junkref(str, r, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 15:
junkref(str, (r ' + refs0) .last, st), validrefs(str, r ' + refs0, st[r -- _type] .type, st) ⊦ junkref(str, r, st)

Rule argument

[emptyarg]

Additional information

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