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I did a fresh local setup with current trunk; all defaults plus use of memcached, where I listed "localhost" in the servers field. This produces these lines in config:

  ## Shared memory settings
  $wgMainCacheType    = CACHE_MEMCACHED;
  $wgMemCachedServers = array( 'localhost' );


The memcached client library seems to assume that hosts will be consistently provided in "<host>:<port>" format, leading to a notice being thrown here if we got an entry that only had the host:

Notice: Undefined offset: 1 in /var/www/wiki/includes/memcached-client.php on line 692

Call Stack:
    0.0016     684584   1. {main}() /var/www/wiki/index.php:0
    0.0037     732512   2. require_once('/var/www/wiki/includes/WebStart.php') /var/www/wiki/index.php:41
    0.0220    1779440   3. require_once('/var/www/wiki/includes/Setup.php') /var/www/wiki/includes/WebStart.php:142
    0.0562    4320528   4. wfIncrStats() /var/www/wiki/includes/Setup.php:316
    0.0563    4320912   5. MWMemcached->incr() /var/www/wiki/includes/GlobalFunctions.php:2295
    0.0563    4321128   6. MWMemcached->_incrdecr() /var/www/wiki/includes/memcached-client.php:518
    0.0563    4321128   7. MWMemcached->get_sock() /var/www/wiki/includes/memcached-client.php:828
    0.0563    4321128   8. MWMemcached->sock_to_host() /var/www/wiki/includes/memcached-client.php:759
    0.0563    4321432   9. MWMemcached->_connect_sock() /var/www/wiki/includes/memcached-client.php:1016

That's this code here:

	function _connect_sock( &$sock, $host ) {
		list( $ip, $port ) = explode( ':', $host );

Either we should fix that code to be more pleasant and handle auto fallback to the default memcached port 11211, or the installer should validate the format of provided server entries.