->                                               ->                                     
  v : list = {                                     a : array = {                        
               'pi' <- .pi                                       .pi                    
               'e'  <- .exp                                      .exp                   
             }                                                 }                        
                                                                                        
  say '[' key '] ' value                           say '[' key '] ' value               
  ' key, value -- detach v key, value _            ' key, value -- detach a key, value _
;                                                ;                                      
