Index: src/wp-includes/link-template.php
===================================================================
--- src/wp-includes/link-template.php	(revision 34999)
+++ src/wp-includes/link-template.php	(working copy)
@@ -10,11 +10,11 @@
  * Display the permalink for the current post.
  *
  * @since 1.2.0
- * @since 4.4.0 Added `$id` parameter.
+ * @since 4.4.0 Added the `$post` parameter.
  *
- * @param int|WP_Post $id Optional. Post ID or post object. Default current post.
+ * @param int|WP_Post $post Optional. Post ID or post object. Default is the global `$post`.
  */
-function the_permalink( $id = 0 ) {
+function the_permalink( $post = 0 ) {
 	/**
 	 * Filter the display of the permalink for the current post.
 	 *
@@ -22,7 +22,7 @@
 	 *
 	 * @param string $permalink The permalink for the current post.
 	 */
-	echo esc_url( apply_filters( 'the_permalink', get_permalink( $id ) ) );
+	echo esc_url( apply_filters( 'the_permalink', get_permalink( $post ) ) );
 }
 
 /**
@@ -94,12 +94,13 @@
  *
  * @see get_permalink()
  *
- * @param int|WP_Post $id        Optional. Post ID or post object. Default current post.
+ * @param int|WP_Post $post      Optional. Post ID or post object. Default is the global `$post`.
  * @param bool        $leavename Optional. Whether to keep post name or page name. Default false.
+ *
  * @return string|false The permalink URL or false if post does not exist.
  */
-function get_the_permalink( $id = 0, $leavename = false ) {
-	return get_permalink( $id, $leavename );
+function get_the_permalink( $post = 0, $leavename = false ) {
+	return get_permalink( $post, $leavename );
 }
 
 /**
@@ -107,11 +108,11 @@
  *
  * @since 1.0.0
  *
- * @param int|WP_Post $id        Optional. Post ID or post object. Default current post.
+ * @param int|WP_Post $post      Optional. Post ID or post object. Default is the global `$post`.
  * @param bool        $leavename Optional. Whether to keep post name or page name. Default false.
  * @return string|false The permalink URL or false if post does not exist.
  */
-function get_permalink( $id = 0, $leavename = false ) {
+function get_permalink( $post = 0, $leavename = false ) {
 	$rewritecode = array(
 		'%year%',
 		'%monthnum%',
@@ -126,11 +127,10 @@
 		$leavename? '' : '%pagename%',
 	);
 
-	if ( is_object($id) && isset($id->filter) && 'sample' == $id->filter ) {
-		$post = $id;
+	if ( is_object( $post ) && isset( $post->filter ) && 'sample' == $post->filter ) {
 		$sample = true;
 	} else {
-		$post = get_post($id);
+		$post = get_post( $post );
 		$sample = false;
 	}