t = db.jstests_drop3;
sub = t.sub;

t.drop();
sub.drop();


for (var i = 0; i < 10; i++){
    t.insert({});
    sub.insert({});
}

var cursor    = t.find().batchSize(2);
var subcursor = sub.find().batchSize(2);

cursor.next();
subcursor.next();
assert.eq( cursor.objsLeftInBatch(), 1 );
assert.eq( subcursor.objsLeftInBatch(), 1 );

t.drop(); // should invalidate cursor, but not subcursor
db.getLastError();

assert.throws( function(){ cursor.itcount() } );  // throws "cursor doesn't exist on server" error on getMore
assert.eq( subcursor.itcount(), 9 ); //one already seen




