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Proof step 20 from proof validref-class (previous step)

st[r -- _type] .type = mkclasstype(class), validref(str, r, ty, st), is_referencevalue(st[r -- fs ']), fs ' ∈ instfields(class), ¬ validref(str, st[r -- fs '] .refval, fs .type, st) ∨ ¬ st[r -- (fs ' ' + _type ')] .type ≤ fs .type, is_reftype(fs .type) ∨ fs .type = abstract_type ⊦ r = jvmref, st[r -- fs '] .refval = jvmref

Heuristic elimination applied rule insert elim lemma

And obtained the following new goals

Proof step 19:
fs = mkfs(class0, ty0, fieldvar), st[r -- _type] .type = mkclasstype(class), validref(str, r, ty, st), is_referencevalue(st[r -- fs ']), fs ' ∈ instfields(class), ¬ validref(str, st[r -- fs '] .refval, ty0, st) ∨ ¬ st[r -- (fs ' ' + _type ')] .type ≤ ty0, is_reftype(ty0) ∨ ty0 = abstract_type ⊦ r = jvmref, st[r -- fs '] .refval = jvmref

Rule argument

[speclemmaarg: , class = fs .class ∧ ty = fs .type ∧ fieldvar = fs .field ↔ fs = mkfs(class, ty, fieldvar) ,[fs, class, ty, fieldvar] → [fs, class0, ty0, fieldvar] ,T ,fieldspec , ,elim ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPELIM : ⊦ class = fs .class ∧ ty = fs .type ∧ fieldvar = fs .field ↔ fs = mkfs(class, ty, fieldvar)])], [EXTRATERMS : (fs, class0, ty0, fieldvar)]]