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Proof step 25 from proof validrefnotnull-union-at-right (previous step)

st0[r -- _type] .type = mkclasstype(class0), class0 ≤ class, mkfs(class1, ty, fieldvar) ' ∈ instfields(class), is_obj(str, r, st0) ⊦ st[r -- mkfs(class1, ty, fieldvar) '] = noval, r = jvmref, r -- mkfs(class1, ty, fieldvar) ' ∈ st0, (is_reftype(ty) ∨ ty = abstract_type) ∧ noval .refval ≠ jvmref, ∃ fs. fs ' ∈ instfields(class0) ∧ is_referencevalue(st0[r -- fs ']) ∧ st0[r -- fs '] .refval ≠ jvmref ∧ (¬ st0[st0[r -- fs '] .refval -- _type] .type ≤ fs .type ∨ junkref(str, st0[r -- fs '] .refval, st0))

User applied rule exists right

And obtained the following new goals

Proof step 24:
st0[r -- _type] .type = mkclasstype(class0), class0 ≤ class, mkfs(class1, ty, fieldvar) ' ∈ instfields(class), is_obj(str, r, st0) ⊦ st[r -- mkfs(class1, ty, fieldvar) '] = noval, r = jvmref, r -- mkfs(class1, ty, fieldvar) ' ∈ st0, (is_reftype(ty) ∨ ty = abstract_type) ∧ noval .refval ≠ jvmref, mkfs(class1, ty, fieldvar) ' ∈ instfields(class0) ∧ is_referencevalue(st0[r -- mkfs(class1, ty, fieldvar) ']) ∧ st0[r -- mkfs(class1, ty, fieldvar) '] .refval ≠ jvmref ∧ ( ¬ st0[st0[r -- mkfs(class1, ty, fieldvar) '] .refval -- _type] .type ≤ mkfs(class1, ty, fieldvar) .type ∨ junkref(str, st0[r -- mkfs(class1, ty, fieldvar) '] .refval, st0))

Rule argument

[EXRARG : pos: right 5, [extquanttermlist: (mkfs(class1, ty, fieldvar)) abort:F , discard:T , computed:T ]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (mkfs(class1, ty, fieldvar))]]