Index: src/wp-admin/includes/class-wp-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-list-table.php	(revision 37557)
+++ src/wp-admin/includes/class-wp-list-table.php	(working copy)
@@ -686,6 +686,9 @@
 				$approved_comments ? __( 'No pending comments' ) : __( 'No comments' )
 			);
 		}
+		if ( ! comments_open( $post_id ) ) {
+			printf( '<span aria-hidden="true" class="dashicons dashicons-lock"></span><span class="screen-reader-text">%s</span>', __( 'Comments are closed' ) );
+		}
 	}

 	/**