render_field() method in ACF-Reusable-Field-Group extension for Advanced Custom Fields/Pro Plugin

acf-reusable_field_group-v5.php

<?php

// ...

// @ line 137
# see https://github.com/tybruffy/ACF-Reusable-Field-Group/blob/master/acf-reusable_field_group-v5.php#L137

	function render_field( $field ) {
		global $post;
		$current_id = $post->ID; ### $post is not defined/availabe on a Settings page
		
		$group  = _acf_get_field_group_by_key($field["group_key"]);
		$fields = acf_get_fields($group);

		acf_render_fields($current_id, $fields);
	}
	
// ...