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Proof step 75 from proof maxpath-object (previous step)

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)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 74:
st[r -- fs '] = refval(r0), maxpath(str, r, st) ≤ maxpath(str, r0, st), is_obj(str, r, st), fs ' ∈ instfields(st[r -- _type] .type .class) ⊦ # validrefset(str, r, st) = 0, validrefset(str, r, st) = ∅, cyclic(str, r, st), junkref(str, r, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPFORWARD : ⊦ # refsset ≠ 0 → refsset ≠ ∅], [CSIMPFORWARD : ⊦ refsset ≠ ∅ → # refsset ≠ 0])]]