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Proof step 19 from proof validref-class (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 18:
st[r -- _type] .type = mkclasstype(class), validref(str, r, ty, st), is_referencevalue(st[r -- mkfs(class0, ty0, fieldvar) ']), mkfs(class0, ty0, fieldvar) ' ∈ instfields(class), is_reftype(ty0), ¬ validref(str, st[r -- mkfs(class0, ty0, fieldvar) '] .refval, ty0, st) ∨ ¬ st[r -- (mkfs(class0, ty0, fieldvar) ' ' + _type ')] .type ≤ ty0 ⊦ r = jvmref, st[r -- mkfs(class0, ty0, fieldvar) '] .refval = jvmref, ty0 = abstract_type

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ mkfs (class0, abstract_type, fieldvar) ' ∈ instfields(class)])]]