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Proof step 9 from proof unchanged-rec-generic (previous step)

¬ (r ≠ jvmref ∧ ¬ is_valid_ref(str, r, st)), st[r -- mkfs(class, ty, fieldvar) '] = refval(r0), st[r -- _type] .type = mkclasstype(class0), unchanged(str, r, st, st0), mkfs(class, ty, fieldvar) ' ∈ instfields(class0) ⊦ r = jvmref, junkref(str, r, st), unchanged(str, r0, st, st0), is_obj(str, r, st) ∧ (r0 ≠ jvmref → st[r0 -- _type] .type ≤ ty ∧ is_valid_ref(str, r0, st))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 8:
st[r -- mkfs(class, ty, fieldvar) '] = refval(r0), st[r -- _type] .type = mkclasstype(class0), unchanged(str, r, st, st0), mkfs(class, ty, fieldvar) ' ∈ instfields(class0), is_obj(str, r, st) ⊦ r = jvmref, r0 = jvmref, junkref(str, r, st), unchanged(str, r0, st, st0), st[r0 -- _type] .type ≤ ty ∧ is_valid_ref(str, r0, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPNAMEDSEQ : addfuns, , is_valid_ref-type-01, ⊦ st[r -- _type] .type = mkclasstype(class) → ( is_valid_ref(str, r, st) ↔ is_obj(str, r, st))])]]