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

date_field_widget_error in core/modules/date/date.module
Implements hook_field_widget_error().
email_field_widget_error in core/modules/email/email.module
Implements hook_field_widget_error().
field_example_field_widget_error in modules/examples/field_example/field_example.module
Implements hook_field_widget_error().
field_test_field_widget_error in core/modules/field/tests/field_test/field_test.field.inc
Implements hook_field_widget_error().
link_field_widget_error in core/modules/link/link.module
Implements hook_field_widget_error().
number_field_widget_error in core/modules/field/modules/number/number.module
Implements hook_field_widget_error().
options_field_widget_error in core/modules/field/modules/options/options.module
Implements hook_field_widget_error().
taxonomy_field_widget_error in core/modules/taxonomy/taxonomy.module
Implements hook_field_widget_error().
text_field_widget_error in core/modules/field/modules/text/text.module
Implements hook_field_widget_error().