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Proof step 89 from proof maxpath-object (previous step)

st[r -- fs '] = refval(r0), fs ' ∈ instfields(st[r -- _type] .type .class), is_obj(str, r, st), maxpath(str, r, st) ≤ maxpath(str, r0, st) ⊦ junkref(str, r, st), cyclic(str, r, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ validrefset(str, r, st) = ∅ → maxpath(str, r, st) = 0
Proof step 75:
validrefset(str, r, st) ≠ ∅, st[r -- fs '] = refval(r0), fs ' ∈ instfields(st[r -- _type] .type .class), is_obj(str, r, st), maxpath(str, r, st) ≤ maxpath(str, r0, st) ⊦ junkref(str, r, st), cyclic(str, r, st)
Proof step 88:
validrefset(str, r, st) = ∅, st[r -- fs '] = refval(r0), fs ' ∈ instfields(st[r -- _type] .type .class), is_obj(str, r, st), 0 ≤ maxpath(str, r0, st) ⊦ junkref(str, r, st), cyclic(str, r, st)

Rule argument

[crewrite-arg: maxpath-zero, F, [st, r, str] → [st, r, str]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, r, str)]]