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Proof step 30 from proof validrefnotnull-union-at-right (previous step)

st0[r -- _type] .type = mkclasstype(class0), class0 ≤ class, r = jvmref ∨ st0[r -- _type] .type ≤ mkclasstype(class) ∧ ¬ junkref(str, r, st0), mkfs(class1, ty, fieldvar) ' ∈ instfields(class) ⊦ st[r -- mkfs(class1, ty, fieldvar) '] = noval, r = jvmref, 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 29:
st0[r -- _type] .type = mkclasstype(class0), mkfs(class1, ty, fieldvar) ' ∈ instfields(class), class0 ≤ class ⊦ r = jvmref, st[r -- mkfs(class1, ty, fieldvar) '] = noval, junkref(str, r, st0), r -- mkfs(class1, ty, fieldvar) ' ∈ st0, (is_reftype(ty) ∨ ty = abstract_type) ∧ noval .refval ≠ jvmref

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ mkclasstype(class1) ≤ mkclasstype(class2) ↔ class1 ≤ class2])]]