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

refs0 .first = st[r -- fs '] .refval, is_obj(str, r, st), fs ' ∈ instfields(st[r -- _type] .type .class), is_referencevalue(st[r -- fs ']), validrefs(str, refs0, fs .type, st) ⊦ refs0 = [], r = refs0 .last, ∃ fs0. fs0 ' ∈ instfields(st[r -- _type] .type .class) ∧ is_referencevalue(st[r -- fs0 ']) ∧ ( st[r -- fs0 '] .refval ≠ jvmref ∧ st[st[r -- fs0 '] .refval -- _type] .type ≤ fs0 .type ∧ path∃(str, st[r -- fs0 '] .refval, refs0 .last, st) ∨ st[r -- fs0 '] .refval = jvmref ∧ refs0 .last = jvmref)

User applied rule exists right

And obtained the following new goals

Proof step 15:
refs0 .first = st[r -- fs '] .refval, is_obj(str, r, st), fs ' ∈ instfields(st[r -- _type] .type .class), is_referencevalue(st[r -- fs ']), validrefs(str, refs0, fs .type, st) ⊦ refs0 = [], r = refs0 .last, fs ' ∈ instfields(st[r -- _type] .type .class) ∧ is_referencevalue(st[r -- fs ']) ∧ ( st[r -- fs '] .refval ≠ jvmref ∧ st[st[r -- fs '] .refval -- _type] .type ≤ fs .type ∧ path∃(str, st[r -- fs '] .refval, refs0 .last, st) ∨ st[r -- fs '] .refval = jvmref ∧ refs0 .last = jvmref)

Rule argument

[EXRARG : pos: right 3, [extquanttermlist: (fs)abort:F, discard:T, computed:T]]

Additional information

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