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Proof step 17 from proof validref-forward (previous step)

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

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ validref(str, r, ty, st) ↔ r = jvmref ∨ st[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st)
Proof step 16:
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)

Rule argument

[crewrite-arg: validref-def , F , [st, ty, r, str] → [st0, ty, st0[r -- mkfs(class0, ty, fieldvar) '] .refval, str] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st0, ty, st0[r -- mkfs(class0, ty, fieldvar) '] .refval, str)]]