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Proof step 86 from proof maxpath-object (previous step)

∃ refs. validrefs(str, refs, st[r -- _type] .type, st) ∧ refs ≠ [] ∧ ¬ dups(refs) ∧ refs .first = r ∧ ¬ has_reffield(refs .last, st), validrefset(str, r, st) = ∅, st[r -- fs '] = refval(r0), fs ' ∈ instfields(st[r -- _type] .type .class), is_obj(str, r, st) ⊦ junkref(str, r, st), cyclic(str, r, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 85:
validrefset(str, refs .first, st) = ∅, st[refs .first -- fs '] = refval(r0), validrefs(str, refs, st[refs .first -- _type] .type, st), fs ' ∈ instfields(st[refs .first -- _type] .type .class), is_obj(str, refs .first, st) ⊦ refs = [], junkref(str, refs .first, st), cyclic(str, refs .first, st), has_reffield(refs .last, st), dups(refs)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]