make Scanner a struct

source/dyaml/loader.d

@@ -152,7 +152,7 @@ struct Loader
             try
             {
                 reader_      = new Reader(yamlData);
-                scanner_     = new Scanner(reader_);
+                scanner_     = Scanner(reader_);
                 parser_      = new Parser(scanner_);
             }
             catch(YAMLException e)

source/dyaml/queue.d

@@ -95,7 +95,22 @@ public:
     @disable bool opEquals(ref Queue);
     @disable int opCmp(ref Queue);
 
-    @disable this(this);
+    this(this) @safe nothrow @nogc
+    {
+        auto node = first_;
+        first_ = null;
+        last_ = null;
+        while (node !is null)
+        {
+            Node* newLast = makeNewNode(node.payload_);
+            if (last_ !is null)
+                last_.next_ = newLast;
+            if (first_ is null)
+                first_      = newLast;
+            last_ = newLast;
+            node = node.next_;
+        }
+    }
 
     ~this() @safe nothrow @nogc
     {

source/dyaml/scanner.d

@@ -79,7 +79,7 @@ class ScannerException : MarkedYAMLException
 }
 
 /// Generates tokens from data provided by a Reader.
-final class Scanner
+struct Scanner
 {
     private:
         /// A simple key is a key that is not denoted by the '?' indicator.