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Proof step 5 from proof validref-not-junkrefs (previous step)

junkrefs(str, r ' + refs, ty, st), st[r -- _type] .type ≤ ty ⊦ r = jvmref, junkrefs(str, r ' + refs, st[r -- _type] .type, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ junkrefs(str, refs, ty0, st) ∧ ty ≤ ty0 → junkrefs(str, refs, ty, st)

Rule argument

[crewrite-arg: junkrefs-subtype , F , [str, refs, ty0, st, ty] → [str, r ' + refs, ty, st, st[r -- _type] .type] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (str, r ' + refs, ty, st, st[r -- _type] .type)]]