t = db.ttl;
t.drop();

// Create a non compliant, compound ttl index.
db.foo.ensureIndex( { a:1, b:1 }, { expireAfterSeconds : 10 } );

// Wait for the ttl thread to pick up the non compliant index.
sleep( 60 * 1.5 * 1000 );

// Drop the collection with the non compliant index.
db.foo.drop();

// Standard ttl test

now = (new Date()).getTime();

for ( i=0; i<24; i++ )
    t.insert( { x : new Date( now - ( 3600 * 1000 * i ) ) } );
db.getLastError();

assert.eq( 24 , t.count() );

t.ensureIndex( { x : 1 } , { expireAfterSeconds : 20000 } );

assert.soon( 
    function() {
        return t.count() < 24;
    }, "never deleted" , 120 * 1000
);

assert.eq( 0 , t.find( { x : { $lt : new Date( now - 20000000 ) } } ).count() );
assert.eq( 6 , t.count() );

Sun Jun 24 22:49:46 [TTLMonitor] ERROR: backgroundjob TTLMonitorerror: key for ttl index can only have 1 field
Sun Jun 24 22:49:46 [TTLMonitor] ERROR: Client::shutdown not called: TTLMonitor