test/ent13 - third_party/libxml2 - Git at Google

 <?xml version='1.0' ?>
 <!DOCTYPE test [
 <!ENTITY ampproblem '&amp;'>
 ]>
 <t a="&ampproblem;">a</t>
	<?xml version='1.0' ?>
	<!DOCTYPE test [
	<!ENTITY ampproblem '&'>
	]>
	<t a="&ampproblem;">a</t>