D25801.1737261600.diff
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D25801.1737261600.diff
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	diff --git a/src/parser/xhpast/api/XHPASTNode.php b/src/parser/xhpast/api/XHPASTNode.php
	--- a/src/parser/xhpast/api/XHPASTNode.php
	+++ b/src/parser/xhpast/api/XHPASTNode.php
	@@ -240,7 +240,7 @@
	switch ($c) {
	case 'x':
	$u = isset($value[$ii + 1]) ? $value[$ii + 1] : null;
	- if (!preg_match('/^[a-f0-9]/i', $u)) {
	+ if ($u === null \|\| !preg_match('/^[a-f0-9]/i', $u)) {
	// PHP treats \x followed by anything which is not a hex digit
	// as a literal \x.
	$out .= '\\\\'.$c;