! err71_isready_unknown.jnl
! ticket 2533, variable b depending on undefined variable c is 
! reported not ready, but variable a with a regridding operation is
! mistakenly reported ready.

use coads_climatology
let a = b[gxy=sst[d=1]]
let b = c

! both should return 0
say `b,r=isready`
say `a,r=isready`

! And VTREE reported no unknown variables in its tree
! The line for C should say UNKNOWN VARIABLE
sho var/tree a

