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Proof step 19 from proof maxpath-object (previous step)

is_obj(r, st), st[r -- fs '] = refval(r0), maxpath(str, r, st) = 1, 1 ≤ maxpath(str, r0, st), validrefs(str, r ', st[r -- _type] .type, st), fs ' ∈ instfields(st[r -- _type] .type .class), is_obj(str, r, st) ⊦ validrefset(str, r, st) = ∅, # validrefset(str, r, st) = 0, maxpath(str, r0, st) = 0, junkref(str, r, st), cyclic(str, r, st), ∃ fs. fs ' ∈ instfields(st[r -- _type] .type .class) ∧ is_reftype(fs .type)

User applied rule exists right

And obtained the following new goals

Rule argument

[EXRARG : pos: right 6, [extquanttermlist: (fs)abort:F, discard:T, computed:T]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (fs)]]