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Proof step 18 from proof validrefnotnull-union-at-right (previous step)

st0[r -- _type] .type = mkclasstype(class0), is_typevalue(st0[r -- _type]), r -- _type ∈ st0, class0 ≤ class, mkfs(class1, ty, fieldvar) ' ∈ instfields(class), r ∈ st0, class+∃(str, class0), r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class0)) ∈ st0 ∧ goodfieldsandtypes(r, instfields(class0), st0) ⊦ r = jvmref, st[r -- mkfs(class1, ty, fieldvar) '] = noval, is_abstract(class0), r -- mkfs(class1, ty, fieldvar) ' ∈ st0, (is_reftype(ty) ∨ ty = abstract_type) ∧ noval .refval ≠ jvmref

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 17:
st0[r -- _type] = typeval(mkclasstype(class0)), class+∃(str, class0), r ∈ st0, mkfs(class1, ty, fieldvar) ' ∈ instfields(class), class0 ≤ class, r -- _type ∈ st0, goodfieldsandtypes(r, instfields(class0), st0) ⊦ r = jvmref, st[r -- mkfs(class1, ty, fieldvar) '] = noval, r -- mkfs(class1, ty, fieldvar) ' ∈ st0, is_abstract(class0), (is_reftype(ty) ∨ ty = abstract_type) ∧ noval .refval ≠ jvmref

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ is_typevalue(typeval(ty))], [CSIMPSEQ : ⊦ mkclasstype(class) = mkclasstype(class0) ↔ class = class0], [CSIMPSEQ : ⊦ typeval(ty) .type = ty], [CSIMPSEQ : ⊦ rk × val ∈ st ↔ rk ∈ st ∧ st[rk] = val])]]