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diff --git a/tests/programs/o3deep.zc b/tests/programs/o3deep.zc
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+// o3 recursion nests on the host stack as deep as the machine's own stacks allow
+o3 int deep(int n) { if (n == 0) return 0; return 1 + deep(n - 1); }
+fn main() { put_n(deep(30000)); put_c(10); return 0; }