Add convenience attribute operator to NodeSeq

Compared to the current method of reading the string text of an
attribute:

(x \ "@bar").text

...the new operator removes the need for a pair of parenthesis and
shortens the overall expression by 7 chars :

x \@ "bar"



Discussion on scala-internals:

https://groups.google.com/d/topic/scala-internals/BZ-tfbebDqE/discussion

1 files changed, 7 insertions, 0 deletions

diff --git a/test/files/jvm/xmlattr.scala b/test/files/jvm/xmlattr.scala
index d214642eb6..6423268ba7 100644
--- a/test/files/jvm/xmlattr.scala
+++ b/test/files/jvm/xmlattr.scala
@@ -6,6 +6,7 @@ object Test {
     UnprefixedAttributeTest()
     AttributeWithOptionTest()
     AttributeOutputTest()
+    AttributeOperatorTest()
   }
   
   object UnprefixedAttributeTest {
@@ -60,4 +61,10 @@ object Test {
     }
   }
 
+  object AttributeOperatorTest {
+    def apply() {
+      val xml = <foo bar="apple" />
+      assert(xml \@ "bar" == "apple")
+    }
+  }
 }