diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-includes/Text/Diff/Engine/shell.php
--- a/wp/wp-includes/Text/Diff/Engine/shell.php	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-includes/Text/Diff/Engine/shell.php	Tue Dec 15 13:49:49 2020 +0100
@@ -83,7 +83,7 @@
 
             if ($from_line_no < $match[1] || $to_line_no < $match[4]) {
                 // copied lines
-                assert('$match[1] - $from_line_no == $match[4] - $to_line_no');
+                assert($match[1] - $from_line_no == $match[4] - $to_line_no);
                 array_push($edits,
                     new Text_Diff_Op_copy(
                         $this->_getLines($from_lines, $from_line_no, $match[1] - 1),