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Proof step 15 from proof validref-class (previous step)

st[r -- _type] .type = mkclasstype(class), st[r -- mkfs(class0, ty0, fieldvar) '] = refval(r0), is_reftype(ty0), mkfs(class0, ty0, fieldvar) ' ∈ instfields(class), r = jvmref ∨ st[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st), ¬ validref(str, r0, ty0, st) ∨ ¬ st[r -- (mkfs(class0, ty0, fieldvar) ' ' + _type ')] .type ≤ ty0 ⊦ ty0 = abstract_type, r0 = jvmref, r = jvmref

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 14:
st[r -- mkfs(class0, ty0, fieldvar) '] = refval(r0), st[r -- _type] .type = mkclasstype(class), mkfs(class0, ty0, fieldvar) ' ∈ instfields(class), is_reftype(ty0), is_classtype(ty), class ≤ ty .class, ¬ validref(str, r0, ty0, st) ∨ ¬ st[r -- (mkfs(class0, ty0, fieldvar) ' ' + _type ')] .type ≤ ty0 ⊦ r = jvmref, r0 = jvmref, ty0 = abstract_type, junkref(str, r, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ mkclasstype(class) ≤ ty ↔ is_classtype(ty) ∧ class ≤ ty .class])]]