lean4-htt/tests/lean/run/meta2.lean

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import system.IO
meta definition foo : nat → nat
| a := nat.cases_on a 1 (λ n, foo n + 2)
vm_eval (foo 10)
meta definition loop : nat → IO unit
| a := do put_str ">> ", put_nat a, put_str "\n", loop (a+1)