$ idris interp.idr
     ____    __     _
    /  _/___/ /____(_)____
    / // __  / ___/ / ___/     Version 0.12.3
  _/ // /_/ / /  / (__  )      http://www.idris-lang.org/
 /___/\__,_/_/  /_/____/       Type :? for help

Type checking ./interp.idr
*interp> :exec
Enter a number: 6
720
*interp>
