! bn_return_defined.jnl
! 5/3/2015 *acm*
! `return=defined` returns 1 if the user variable is defined
! see ticket 2293

let a = b
say `a,r=defined` `b,r=defined`

! abbreviate to 3 letters
use levitus_climatology
let temp2 = 2*temp
say `temp2,return=def`

! returns false for file variables
say `temp,return=defined`
