reverted:
--- b/core/includes/errors.inc
+++ a/core/includes/errors.inc
@@ -81,10 +81,10 @@
  * Decodes an exception and retrieves the correct caller.
  *
+ * @param $exception
- * @param exception $exception
  *   The exception object that was thrown.
  *
+ * @return
- * @return array
  *   An error in the format expected by _drupal_log_error().
  */
   // Add the line throwing the exception to the backtrace.
   array_unshift($backtrace, array('line' => $exception->getLine(), 'file' => $exception->getFile()));
reverted:
--- b/core/lib/Drupal/Core/Extension/ModuleHandler.php
+++ a/core/lib/Drupal/Core/Extension/ModuleHandler.php
@@ -646,18 +646,8 @@
         // Record the fact that it was installed.
         $modules_installed[] = $module;
 
+        // Allow the module to perform install tasks.
+        $this->invoke($module, 'install');
-        try {
-          // Allow the module to perform install tasks.
-          $this->invoke($module, 'install');
-        }
-        catch (\Exception $e) {
-          // In the rare case there is an exception, log this to watchdog
-          // instead of just dumping the error...
-          watchdog_exception('system', $e, 'Exception thrown by %module during hook_install', array('%module' => $module), WATCHDOG_ERROR);
-          // ...and then throw it again so that the user knows and the
-          // exception is not compounded with other modules installing.
-          throw $e;
-        }
         // Record the fact that it was installed.
         watchdog('system', '%module module installed.', array('%module' => $module), WATCHDOG_INFO);
       }
only in patch2:
unchanged:
--- a/core/lib/Drupal/Core/Extension/ModuleInstaller.php
+++ b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
@@ -285,8 +285,17 @@ public function install(array $module_list, $enable_dependencies = TRUE) {
         // @see https://drupal.org/node/2208429
         \Drupal::service('theme_handler')->refreshInfo();
 
-        // Allow the module to perform install tasks.
-        $this->moduleHandler->invoke($module, 'install');
+        try {
+          // Allow the module to perform install tasks.
+          $this->moduleHandler->invoke($module, 'install');
+        } catch (\Exception $e) {
+          // In the rare case there is an exception, log this to watchdog
+          // instead of just dumping the error...
+          watchdog_exception('system', $e, 'Exception thrown by %module during hook_install', array('%module' => $module), E_ERROR);
+          // ...and then throw it again so that the user knows and the
+          // exception is not compounded with other modules installing.
+          throw $e;
+        }
 
         // Record the fact that it was installed.
         \Drupal::logger('system')->info('%module module installed.', array('%module' => $module));
only in patch2:
unchanged:
--- a/core/lib/Drupal/Core/Utility/Error.php
+++ b/core/lib/Drupal/Core/Utility/Error.php
@@ -47,6 +47,18 @@ public static function decodeException(\Exception $exception) {
     // Add the line throwing the exception to the backtrace.
     array_unshift($backtrace, array('line' => $exception->getLine(), 'file' => $exception->getFile()));
 
+    // If there are closures in the exception, modify the backtrace.
+    foreach ($backtrace as &$trace) {
+      if (isset($trace['args'])) {
+        foreach ($trace['args'] as $k => $arg) {
+          if ($arg instanceof \Closure) {
+            // Remove the closure to prevent problems later.
+            unset($trace['args'][$k]);
+          }
+        }
+      }
+    }
+
     // For PDOException errors, we try to return the initial caller,
     // skipping internal functions of the database layer.
     if ($exception instanceof \PDOException || $exception instanceof DatabaseExceptionWrapper) {