import silent - handle selectors containing amp

lib/less/tree/ruleset.js

@@ -376,11 +376,11 @@ tree.Ruleset.prototype = {
                             if (sel.length > 0) {
                                 newSelectorPath = sel.slice(0);
                                 lastSelector = newSelectorPath.pop();
-                                newJoinedSelector = new(tree.Selector)(lastSelector.elements.slice(0), selector.extendList);
+                                newJoinedSelector = selector.createDerived(lastSelector.elements.slice(0));
                                 newJoinedSelectorEmpty = false;
                             }
                             else {
-                                newJoinedSelector = new(tree.Selector)([], selector.extendList);
+                                newJoinedSelector = selector.createDerived([]);
                             }
 
                             //put together the parent selectors after the join
@@ -442,7 +442,7 @@ tree.Ruleset.prototype = {
 
             // if the previous thing in sel is a parent this needs to join on to it
             if (sel.length > 0) {
-                sel[sel.length - 1] = new(tree.Selector)(sel[sel.length - 1].elements.concat(elements), sel[sel.length - 1].extendList);
+                sel[sel.length - 1] = sel[sel.length - 1].createDerived(sel[sel.length - 1].elements.concat(elements));
             }
             else {
                 sel.push(new(tree.Selector)(elements));

lib/less/tree/selector.js

@@ -11,6 +11,9 @@ tree.Selector.prototype = {
         this.elements = visitor.visit(this.elements);
         this.extendList = visitor.visit(this.extendList)
     },
+    createDerived: function(elements) {
+      return new(tree.Selector)(elements, this.extendList, this.index, this.currentFileInfo);
+    },
     match: function (other) {
         var elements = this.elements,
             len = elements.length,

test/css/import-silent.css

@@ -1,3 +1,6 @@
 .b {
   color: red;
 }
+.b .c {
+  color: green;
+}

test/less/import/import-silent.less

@@ -1,3 +1,11 @@
 .a {
   color: red;
+  .c {
+    color: green;
+  }
+}
+.d {
+  &:hover {
+    color: purple;
+  }
 }