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Proof step 107 from proof validref-refs-last-valid-subset (previous step)

st0[r0 -- _type] = typeval(mkclasstype(class0)), st[r0 -- _type] = typeval(mkclasstype(class0)), st0[r0 -- mkfs(class, ty0, fieldvar) '] = refval(r1), acc + r1 ' = r1 ' + refs, st[r0 -- mkfs(class, ty0, fieldvar) '] = refval(r1), is_reftype(ty0), st ⊆ st0, validref(str, r0, mkclasstype(class0), st), class+∃(str, class0), r0 -- _type ∈ st0, r0 ∈ st0, validrefs(str, r1 ' + refs, ty0, st0), mkfs(class, ty0, fieldvar) ' ∈ instfields(class0), class0 ≤ class1, r0 -- mkfs(class, ty0, fieldvar) ' ∈ st0, validref(str, r1, ty0, st), ∀ sk. sk ∈ instfields(class0) → goodfieldandtype(r0, sk, st0), ∀ str, r, st, st0, r1, ty. validref(str, r, st[r -- _type] .type, st) ∧ st ⊆ st0 ∧ r ∈ acc ∧ validrefs(str, acc + r1 ', ty, st0) → validref(str, r1, st[r1 -- _type] .type, st) ⊦ r0 = jvmref, validref(str, r1, st[r1 -- _type] .type, st), is_abstract(class0), r1 ∈ acc

User applied rule cut formula

And obtained the following new goals

Proof step 106:
acc = [], st0[r0 -- _type] = typeval(mkclasstype(class0)), st[r0 -- _type] = typeval(mkclasstype(class0)), st0[r0 -- mkfs(class, ty0, fieldvar) '] = refval(r1), acc + r1 ' = r1 ' + refs, st[r0 -- mkfs(class, ty0, fieldvar) '] = refval(r1), is_reftype(ty0), st ⊆ st0, validref(str, r0, mkclasstype(class0), st), class+∃(str, class0), r0 -- _type ∈ st0, r0 ∈ st0, validrefs(str, r1 ' + refs, ty0, st0), mkfs(class, ty0, fieldvar) ' ∈ instfields(class0), class0 ≤ class1, r0 -- mkfs(class, ty0, fieldvar) ' ∈ st0, validref(str, r1, ty0, st), ∀ sk. sk ∈ instfields(class0) → goodfieldandtype(r0, sk, st0), ∀ str, r, st, st0, r1, ty. validref(str, r, st[r -- _type] .type, st) ∧ st ⊆ st0 ∧ r ∈ acc ∧ validrefs(str, acc + r1 ', ty, st0) → validref(str, r1, st[r1 -- _type] .type, st) ⊦ r0 = jvmref, validref(str, r1, st[r1 -- _type] .type, st), is_abstract(class0), r1 ∈ acc

Rule argument

[fma-arg: acc = []]

Additional information

[[CONCRETESIMPRULES : ([CSIMPFORWARD : ⊦ r ' + refs = refs0 + r0 ' ∧ refs0 ≠ [] → r ∈ refs0 ∧ r0 ∈ refs], [CSIMPSEQ : ⊦ (refs + refs0) + refs1 = refs + refs0 + refs1])], [EXTRAFMAS : (acc = [])]]