--- a/langtools/src/share/classes/com/sun/tools/javac/comp/Lower.java	Mon May 27 13:44:14 2013 +0100
+++ b/langtools/src/share/classes/com/sun/tools/javac/comp/Lower.java	Tue May 28 12:46:10 2013 +0100
@@ -2931,7 +2931,7 @@
             }
             result =
                 make.If(cond,
-                        make_at(detailPos).
+                        make_at(tree).
                            Throw(makeNewClass(syms.assertionErrorType, exnArgs)),
                         null);
         } else {