After D16431, listing the same @annotation multiple times makes the docblock parser return a list.
We have some resources which list @requires or @provides several times, but don't handle the new parser properly. Make the code more flexible, since this is a reasonable way to specify the annotations.
See also D16432. This produces a failure in this form:
[2016-08-23 21:10:15] ERROR 2: trim() expects parameter 1 to be string, array given at [/core/data/drydock/workingcopy-74/repo/phabricator/src/applications/celerity/CelerityResourceMapGenerator.php:236] 2 arcanist(head=master, ref.master=89e8b4852384), phabricator(head=6c940fb71b0a8850c6a1b7f5fc642a8f8135a76a, ref.master=b521f2349e46), phutil(head=master, ref.master=237549280f08) 3 #0 trim(array) called at [<phabricator>/src/applications/celerity/CelerityResourceMapGenerator.php:236] 4 #1 CelerityResourceMapGenerator::getProvidesAndRequires(string, string) called at [<phabricator>/src/applications/celerity/CelerityResourceMapGenerator.php:193] 5 #2 CelerityResourceMapGenerator::rebuildTextResources(CelerityPhabricatorResources, CelerityResourceTransformer) called at [<phabricator>/src/applications/celerity/CelerityResourceMapGenerator.php:54] 6 #3 CelerityResourceMapGenerator::generate() called at [<phabricator>/src/__tests__/PhabricatorCelerityTestCase.php:16] 7 #4 PhabricatorCelerityTestCase::testCelerityMaps() 8 #5 call_user_func_array(array, array) called at [<arcanist>/src/unit/engine/phutil/PhutilTestCase.php:492] 9 #6 PhutilTestCase::run() called at [<arcanist>/src/unit/engine/PhutilUnitTestEngine.php:69] 10 #7 PhutilUnitTestEngine::run() called at [<arcanist>/src/unit/engine/ArcanistConfigurationDrivenUnitTestEngine.php:147] 11 #8 ArcanistConfigurationDrivenUnitTestEngine::run() called at [<arcanist>/src/workflow/ArcanistUnitWorkflow.php:167] 12 #9 ArcanistUnitWorkflow::run() called at [<arcanist>/scripts/arcanist.php:394]