WordPress at a glance
function is not described

woocommerce_checkout_login_form() WC 1.0

Output the WooCommerce Checkout Login Form.

No Hooks.

Return

null. Nothing.

Usage

woocommerce_checkout_login_form();

Code of woocommerce_checkout_login_form() WC 5.2.2

<?php
function woocommerce_checkout_login_form() {
	wc_get_template(
		'checkout/form-login.php',
		array(
			'checkout' => WC()->checkout(),
		)
	);
}