TYPO3 Core

$tmpField1 = array (
    'fancy_field_test' => array(
        'exclude' => 0,
        'label' => 'first working test',
        'config' => array(
            'type' => 'input',
            'size' => 30,
            'eval' => 'trim,required'
        )
    )
);
$tmpField2 = array (
    'test' => array(
        'exclude' => 0,
        'label' => 'second (failing) test',
        'config' => array(
            'type' => 'input',
            'size' => 30,
            'eval' => 'trim,required'
        )
    )
);
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTCAcolumns('pages', $tmpField1);
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addToAllTCATypes('pages', 'fancy_field_test');
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTCAcolumns('pages',$tmpField2);
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addToAllTCATypes('pages', 'test');

tmpField2 won't show up :(
'test' is part of 'fancy_field_test'
reversing the registration order would fix it

Patch set 2 for branch master has been pushed to the review server.
It is available at https://review.typo3.org/25127

Patch set 3 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/25127

Patch set 1 for branch TYPO3_6-1 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/27663

Patch set 1 for branch TYPO3_6-0 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/27671