--- loncom/homework/math_parser/ENode.pm	2015/06/29 15:42:13	1.1
+++ loncom/homework/math_parser/ENode.pm	2015/06/29 17:47:00	1.2
@@ -26,7 +26,7 @@ use strict;
 use warnings;
 use utf8;
 
-use feature "switch"; # Perl 5.10.1
+use Switch 'Perl6';
 
 use aliased 'Apache::math_parser::CalcException';
 use aliased 'Apache::math_parser::Operator';