Issue #2112679 by Berdir, damiankloip, nlisgo, krlucas, lokapujya, m1r1k, piyuesh23, blueminds, stefan.r, subhojit777, dawehner, kerby70, Dustin LeBlanc, znerol, JeroenT, borisson_, scor, amitgoyal, s_leu: getUsername() should return the username getDisplayName() for the formatted user name

Issue #2557113 by stefan.r, alexpott, dawehner, joelpittet, cilefen, lauriii, plach, catch, chx, xjm: Make t() return a TranslationWrapper object to remove reliance on a static, unpredictable safe list

Issue #2487592 by alexpott, JeroenT, Schnitzel, cilefen: CMI: don't ship with a default "active" directory that is empty in most Drupal installations

Issue #2552579 by alexpott: Remove SafeMarkup::placeholder(), deprecate drupal_placeholder() and stop drupal_placeholder() from marking safe

Issue #2221771 by ianthomas_uk, rpayanm, Eli-T, Rolf van de Krol, pjonckiere, xjm, DuaelFr: Mark all simple wrappers in bootstrap.inc and common.inc as deprecated

Issue #2501319 by joelpittet, cwells, stefan.r, YesCT, nlisgo, Cottser, cmanalansan, dawehner, xjm, alexpott, josephdpurcell: Remove SafeMarkup::set() in Error::renderExceptionSafe() and _drupal_log_error() and improve backtrace formatting consistency in _drupal_log_error(), Error::renderExceptionSafe(), and DefaultExceptionSubscriber::onHtml()

Issue #2547851 by alexpott, joelpittet, dawehner, stefan.r, xjm: SafeMarkup::format() should require arguments without them it is just SafeMarkup::set() in disguise

Issue #2467759 by Mile23, andypost, Wim Leers, Berdir, Fabianx, Crell: Refactor drupal_process_attached() so it doesn't depend on drupal_add_http_header()

Issue #2546176 by alexpott: Use SafeStrings to communicate safeness in drupal_set_message and remove SafeMarkup::set()

Issue #2505315 by stefan.r, dawehner, tim.plunkett, Berdir: Catch PHP7 Throwable objects instead of BaseExceptions in the error handler

Issue #2506581 by alexpott, Wim Leers, Fabianx, xjm, joelpittet, Cottser, dawehner: Remove SafeMarkup::set() from Renderer::doRender

Issue #2508231 by timmillwood, amateescu, hussainweb, catch, dawehner, David_Rothstein, Mixologic, effulgentsia: Raise minimum required version of PHP to 5.5.9

Issue #2491155 by mikeburrelljr, Mac_Weber, opdavies: Update drupal.org and kernel.org URLs in core modules (Follow-up to 2489912)

Issue #2289201 by mariano.barcia, webchick: [Meta] Make drupal install and run within reasonable php memory limits so we can reset the memory requirements to lower levels

Issue #1081266 by stefan.r, mikeytown2, jeroen.b, tsphethean, mfb, joseph.olstad, marcelovani: Avoid re-scanning module directory when a filename or a module is missing

Issue #2232861 by grom358, daffie, alexpott, larowlan, pfrenssen, hussainweb, pcambra, jibran, phenaproxima, moshe weitzman, nick_schuch: Create BrowserTestBase for web-testing on top of Mink

Issue #2454447 by andypost, dawehner, rteijeiro: Split Utility\String class to support PHP 7 (String is a reserved word)

Issue #2367747 by Palashvijay4O, andypost, Alienpruts, Cottser, er.pushpinderrana, gaurav.pahuja, pfrenssen, rpayanm, vadim.hirbu: Remove usage of system_rebuild_theme_data()

Issue #2443783 by gaurav_varshney, fotuzlab: Remove language_load(), language_list() and language_default() from bootstrap.inc

Issue #2330181 by esod, ashutoshsngh, gaurav_varshney, ranjeet.paliwal, joshi.rohit100, er.pushpinderrana, oriol_e9g: Remove bootstrap.inc module_invoke()

Issue #2421005 by tim.plunkett: Add \Drupal::hasContainer() instead of checking if \Drupal::getContainer() === NULL

Issue #2348679 by znerol, Wim Leers: Move the remaining procedural page cache code to the page cache stack middleware

Issue #2392787 by beejeebus, dawehner, alexpott: Move include statements from DrupalKernel::boot() into DrupalKernel::preHandle()

Issue #2226863 by cs_shadow, filijonka, joelpittet, pguillard: Update stale references to theme functions that have been converted to Twig

Issue #2362227 by dawehner, mpdonadio, znerol, tim.plunkett, skipyT: Replace all instances of current_path()

Issue #2328111 by dawehner, martin107, neclimdul: Replace most instances of the DRUPAL_ROOT constant with the app.root container parameter.

Issue #2267551 followup by jfhovinne: [meta] Deal with PHP requirement vs. Debian PHP version numbering.