preprocessor: eliminate clang warning about using namespace std

preprocessor/SymbolList.hh

@@ -20,12 +20,12 @@
 #ifndef _SYMBOL_LIST_HH
 #define _SYMBOL_LIST_HH
 
-using namespace std;
-
 #include <string>
 #include <vector>
 #include <ostream>
 
+using namespace std;
+
 //! Used to store a list of symbols
 /*! This class is no more than a vector<string>, with a pretty-printer for Matlab */
 class SymbolList

preprocessor/WarningConsolidation.hh

@@ -20,12 +20,12 @@
 #ifndef _WARNINGCONSOLIDATION_HH
 #define _WARNINGCONSOLIDATION_HH
 
-using namespace std;
-
 #include <sstream>
 #include <string>
 #include "location.hh"
 
+using namespace std;
+
 //! Stores Warnings issued by the Preprocessor
 class WarningConsolidation
 {