No subject

    (require "../info.rkt")
    (displayln (#%info-lookup 'version))

But that seems too raw. From searching the docs, eventually I found
`get-info/full`, which I guess would work like this:

    (require setup/getinfo racket/runtime-path)
    (define-runtime-path up "..")
    (define lookup (get-info/full up))
    (and lookup (lookup 'version (const "unknown")))

Is that the best way?