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Proof step 8 from proof validref-not-junkrefs (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 7:
junkrefs(str, r ' + refs, ty, st), st[r -- _type] .type ≤ ty ⊦ r = jvmref, ∃ refs0. refs0 ≠ [] ∧ refs0 .first = r ∧ junkrefs(str, refs0, st[refs0 .first -- _type] .type, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]