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Proof step 2 from proof validref-forward-01 (previous step)

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

User applied rule insert lemma

And obtained the following new goals

Proof step 1:
⊦ r ≠ jvmref ∧ validref(str, r, mkclasstype(class), st0) ∧ fs ' ∈ instfields(class) ∧ is_reftype(fs .type) → validref(str, st0[r -- fs '] .refval, fs .type, st0)

Rule argument

[LEMMAARG : validref-forward, [r, str, class, st0, fs] → [r, str, class, st0, mkfs(class0, ty, fieldvar)]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ mkfs(class, ty, fieldvar) .type = ty])], [EXTRATERMS : (r, str, class, st0, mkfs(class0, ty, fieldvar))]]