Lines:

<?php

/**
 * Server-side rendering of the `core/comments` block.
 *
 * @package WordPress
 */

/* function render_block_core_comments() – Renders the `core/comments` block on the server. */

/* function register_block_core_comments() – Registers the `core/comments` block on the server. */
add_action( 'init', 'register_block_core_comments' );

/* function comments_block_form_defaults() – Use the button block classes for the form-submit button. */
add_filter( 'comment_form_defaults', 'comments_block_form_defaults' );

/* function enqueue_legacy_post_comments_block_styles() – Enqueues styles from the legacy `core/post-comments` block. These styles are
required only by the block’s fallback. */

/* function register_legacy_post_comments_block() – Ensures backwards compatibility for any users running the Gutenberg plugin
who have used Post Comments before it was merged into Comments Query Loop. */
add_action( 'init', 'register_legacy_post_comments_block', 21 );
 

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