Invalid argument supplied for foreach() wget.inc:42

Unable to reproduce.

Saw the same warning today:
Invalid argument supplied for foreach() wget.inc:42
when I ran
drush dl openpublic --select
while building an additional site on a production shared hosting environment that is working fine for Drupal 7 and drush 5.4.

The warning occurred after the package was selected and before the openpublic-beta8 package was downloaded.
The warning points to
/drush/commands/pm/package_handler/wget.inc; line 42 is

    foreach ($files as $key => $file) {
      if ((string)$file->variant == drush_get_option('variant', 'full') && (string)$file->archive_type == 'tar.gz') {
        $release['download_link'] = (string)$file->url;
        $release['mdhash'] = (string)$file->md5;
        break;
      }

That looked too hard to figure out, so I tried something else. I copied
/drush/examples/examples.drush.ini to
/drush/drush.ini, deleted the previously downloaded openpublic package folder, then re-ran "drush dl openpublic --select".

Problem solved. The drush.ini file includes
memory_limit = 128M
which cures random looking problems like this. Basically, when memory limit is reached, php throws an error on whatever command it is on. More memory fixed it.

May I change status to "closed (fixed)"?

This is still a bug when the project has no recommended release.

# drush pm-releases apisite-6.x
------- RELEASES FOR 'APISITE' PROJECT -------
 Release         Date         Status      
 6.x-1.x-dev     2012-Mar-13  Development

# drush dl apisite-6.x
There are no stable releases for project apisite.                                                                                                                                                       [warning]
Choose one of the available releases for apisite:
 [0]  :  Cancel                                      
 [1]  :  6.x-1.x-dev  -  2012-Mar-13  -  Development
1
Undefined index: files wget.inc:41                                                                                                                                                                      [warning]
Invalid argument supplied for foreach() wget.inc:42                                                                                                                                                     [warning]
Unable to download apisite-6.x-1.x-dev.tar.gz_date=1331596969 to /tmp/drush_tmp_1366911238_5179690643fbb from http://ftp.drupal.org/files/projects/apisite-6.x-1.x-dev.tar.gz?date=1331596969           [error]

In addition, this is a problem only for install profiles. Committed a fix to 6.x and 5.x http://drupalcode.org/project/drush.git/commit/423c6c8

OTOH, there's a infraestructure problem. tarballs for old profiles are not available. See http://drupal.org/node/687358/release or http://drupal.org/node/1592456/release

This commit somehow broke this command:

drush make -y --md5 --no-core --contrib-destination=profiles/drupal_forum /PATH_TO_DRUSH/drush/tests/makefiles/recursion.make

Which is part of a test, that somehow is still passing (I'm looking into why that test is passing).

Committed a fix in dadc6cf. The previously committed code was checking the wrong variable ($request instead of $release). As for the failing test, these were failing, but I don't know why travis didn't catch it.