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Proof step 21 from proof validref-class (conclusion)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 20:
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

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ mkclasstype(class) .class = class], [CSIMPSEQ : ⊦ ¬ is_referencevalue(val) → val .refval = jvmref], [CSIMPSEQ : ⊦ sk + sk0 = sk ' + sk0 '])]]