wp-includes/class-wp-block-templates-registry.php:219Unregisters a template.
$template_namestringWP_Block_Template|WP_Error public function unregister( $template_name ) { if ( ! $this->is_registered( $template_name ) ) { /* translators: %s: Template name. */ $error_message = sprintf( __( 'Template "%s" is not registered.' ), $template_name ); _doing_it_wrong( __METHOD__, $error_message, '6.7.0' ); return new WP_Error( 'template_not_registered', $error_message ); } $unregistered_template = $this->registered_templates[ $template_name ]; unset( $this->registered_templates[ $template_name ] ); return $unregistered_template; }Introduced in 6.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-block-templates-registry.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.