Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.

field_system_info_alter in core/modules/field/field.module
Implements hook_system_info_alter().
module_test_system_info_alter in core/modules/simpletest/tests/module_test.module
Implements hook_system_info_alter().
system_system_info_alter in core/modules/system/system.module
Implements hook_system_info_alter().
system_test_system_info_alter in core/modules/simpletest/tests/system_test.module
Implements hook_system_info_alter().
theme_test_system_info_alter in core/modules/simpletest/tests/theme_test.module
Implements hook_system_info_alter().
update_test_system_info_alter in core/modules/update/tests/update_test/update_test.module
Implements hook_system_info_alter().