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Proof step 16 from proof validref-forward (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 15:
st0[r -- _type] .type ≤ mkclasstype(class), mkfs(class0, ty, fieldvar) ' ∈ instfields(class), is_reftype(ty) ⊦ st0[r -- mkfs(class0, ty, fieldvar) '] .refval = jvmref, r = jvmref, junkref(str, r, st0), st0[st0[r -- mkfs(class0, ty, fieldvar) '] .refval -- _type] .type ≤ ty ∧ ¬ junkref(str, st0[r -- mkfs(class0, ty, fieldvar) '] .refval, st0)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]