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Proof step 5 from proof validref-put-null (previous step)

is_reftype(ty0), st[r -- _type] .type ≤ ty, junkref(str, r, st[r0 -- mkfs(class, ty0, fieldvar) ', refval(jvmref)]), r ≠ r0 ∨ _type ≠ mkfs(class, ty0, fieldvar) ' ⊦ r = jvmref, junkref(str, r, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ ¬ junkref(str, r, st) ∧ is_reftype(fs .type) → ¬ junkref(str, r, st[r0 -- fs ', refval(jvmref)])

Rule argument

[crewrite-arg: junkref-put-null , F , [fs, r0, st, r, str] → [mkfs(class, ty0, fieldvar), r0, st, r, str] ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ mkfs(class, ty, fieldvar) .type = ty])], [EXTRATERMS : (mkfs(class, ty0, fieldvar), r0, st, r, str)]]