Correct problem with partial matches

lib/capybara/xpath.rb

@@ -84,7 +84,7 @@ module Capybara
   
     def add_field(locator)
       xpath = append(yield(s(locator)))
-      xpath.append(yield("//label[contains(.,#{s(locator)})]/@for"))
+      xpath = xpath.append(yield("//label[contains(.,#{s(locator)})]/@for"))
       xpath.prepend(yield("//label[text()=#{s(locator)}]/@for"))
     end
   

spec/views/form.erb

@@ -2,8 +2,10 @@
 
 <form action="/form" method="post">
   <p>
-    <label for="form_first_name">First Name</label>
-    <input type="text" name="form[first_name]" value="John" id="form_first_name"/>
+    <label for="form_first_name">
+      First Name
+      <input type="text" name="form[first_name]" value="John" id="form_first_name"/>
+    </label>
   </p>
 
   <p>