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Proof step 7 from proof validref-union (previous step)

r -- _type ∈ st, st[r -- _type] .type ≤ ty, junkref(str, r, st0 ∪ st), r ∈ st ⊦ r = jvmref, junkref(str, r, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 6:
⊦ ¬ junkref(str, r, st) → ¬ junkref(str, r, st0 ∪ st)

Rule argument

[crewrite-arg: junkref-union , F , [st, st0, r, str] → [st, st0, r, str] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, st0, r, str)]]