Fixed bug where the parser doesn't find the end of a map or seq flow

src/scanner.cpp

@@ -51,6 +51,13 @@ namespace YAML
 		return m_tokens.front();
 	}
 
+    // mark
+    // . Returns the current mark in the stream
+    Mark Scanner::mark() const
+    {
+        return INPUT.mark();
+    }
+
 	// EnsureTokensInQueue
 	// . Scan until there's a valid token at the front of the queue,
 	//   or we're sure the queue is empty.