got rid of some spirit warnings

Former-commit-id: a358842770

src/parser/PrismParser.cpp

@@ -159,13 +159,13 @@ namespace storm {
             hidingOrRenamingComposition = hidingComposition | renamingComposition | atomicComposition;
             hidingOrRenamingComposition.name("hiding/renaming composition");
             
-            hidingComposition = (atomicComposition >> qi::lit("/") > (qi::lit("{") > actionNameList > qi::lit("}")))[qi::_val = phoenix::bind(&PrismParser::createHidingComposition, phoenix::ref(*this), qi::_1, qi::_2)];
+            hidingComposition = (atomicComposition >> (qi::lit("/") > (qi::lit("{") > actionNameList > qi::lit("}"))))[qi::_val = phoenix::bind(&PrismParser::createHidingComposition, phoenix::ref(*this), qi::_1, qi::_2)];
             hidingComposition.name("hiding composition");
             
             actionRenamingList = +(identifier >> (qi::lit("<-") >> identifier))[phoenix::insert(qi::_val, phoenix::construct<std::pair<std::string, std::string>>(qi::_2, qi::_1))];
             actionRenamingList.name("action renaming list");
             
-            renamingComposition = (atomicComposition >> qi::lit("{") > (actionRenamingList > qi::lit("}")))[qi::_val = phoenix::bind(&PrismParser::createRenamingComposition, phoenix::ref(*this), qi::_1, qi::_2)];
+            renamingComposition = (atomicComposition >> (qi::lit("{") > (actionRenamingList > qi::lit("}"))))[qi::_val = phoenix::bind(&PrismParser::createRenamingComposition, phoenix::ref(*this), qi::_1, qi::_2)];
             renamingComposition.name("renaming composition");
             
             atomicComposition = qi::lit("(") > parallelComposition > qi::lit(")") | moduleComposition;