-- `ilo --vm file.ilo`, `--jit`, and the default engine all
-- auto-run `main` on a multi-fn file when no func name is supplied.
-- Before the fix, only the default engine did:
-- * --vm -> silent `nil`, exit 0
-- * --jit-> bare "Cranelift JIT: compilation failed"
-- All four are now consistent with the documented auto-pick-main
-- behaviour (SKILL.md: "Multi-function files require either a
-- function name argument or a function called `main`.").
helper a:n>n;+a 1
main>n;helper 41
-- run: main
-- out: 42
-- run: helper 9
-- out: 10