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Proof step 20 from proof validrefnotnull-union-at-right (previous step)

st0[r -- _type] .type = mkclasstype(class0), mkfs(class1, ty, fieldvar) ' ∈ instfields(class), class0 ≤ class, r ≠ jvmref ∧ r -- _type ∈ st0 ∧ is_typevalue(st0[r -- _type]) ∧ is_classtype(st0[r -- _type] .type) ∧ is_obj(r, st0[r -- _type] .type .class, st0), class+∃(str, class0) ⊦ 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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 19:
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), is_obj(r, 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

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ is_classtype(mkclasstype(class))], [CSIMPSEQ : ⊦ mkclasstype(class) .class = class], [CSIMPFORWARD : ⊦ r -- sk ∈ st → r ∈ st])]]