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Proof step 20 from proof junkref-update-equiv (previous step)

st[r -- mkfs(class, ty, fieldvar) '] = refval(r1), is_obj(str, r, st), junkrefs(str, r1 ' + acc, ty, st), mkfs(class, ty, fieldvar) ' ∈ instfields(st[r -- _type] .type .class), is_valid_ref(str, r0, st), validFields(r0, fis, st), st[r1 -- _type] .type ≤ ty, ∀ r0, fis, st, str, r. validFields(r0, fis, st) ∧ is_valid_ref(str, r0, st) ∧ junkrefs(str, r ' + acc, st[r -- _type] .type, st) → junkref(str, r, update(r0, fis, st)) ∨ path∃(str, r, r0, st) ∨ _type ∈ fis ⊦ r = jvmref, r1 = jvmref, r = r0, _type ∈ fis, junkref(str, r1, update(r0, fis, st)), path∃(str, r1, r0, st)

User applied rule all left

And closed the goal!

Rule argument

[EXRARG : pos: left 8, [extquanttermlist: (r0, fis, st, str, r1) abort:F , discard:T , computed:T ]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ (refs + refs0) + refs1 = refs + refs0 + refs1], [CSIMPSEQ : ⊦ junkrefs(str, refs, ty0, st) ∧ ty ≤ ty0 → junkrefs(str, refs, ty, st)])], [EXTRATERMS : (r0, fis, st, str, r1)]]