FormulaParserGrammar: Adding support for time-bounded formulas with exact time-bound, e.g., F=12 "target"

src/storm-parsers/parser/FormulaParserGrammar.cpp

@@ -85,7 +85,9 @@ namespace storm {
             timeBound = ((timeBoundReference >> qi::lit("[")) > expressionParser > qi::lit(",") > expressionParser > qi::lit("]"))
                             [qi::_val = phoenix::bind(&FormulaParserGrammar::createTimeBoundFromInterval, phoenix::ref(*this), qi::_2, qi::_3, qi::_1)]
                         | ( timeBoundReference >> (qi::lit("<=")[qi::_a = true, qi::_b = false] | qi::lit("<")[qi::_a = true, qi::_b = true] | qi::lit(">=")[qi::_a = false, qi::_b = false] | qi::lit(">")[qi::_a = false, qi::_b = true]) >> expressionParser)
-                            [qi::_val = phoenix::bind(&FormulaParserGrammar::createTimeBoundFromSingleBound, phoenix::ref(*this), qi::_2, qi::_a, qi::_b, qi::_1)];
+                            [qi::_val = phoenix::bind(&FormulaParserGrammar::createTimeBoundFromSingleBound, phoenix::ref(*this), qi::_2, qi::_a, qi::_b, qi::_1)]
+                        | ( timeBoundReference >> qi::lit("=") >> expressionParser)
+                            [qi::_val = phoenix::bind(&FormulaParserGrammar::createTimeBoundFromInterval, phoenix::ref(*this), qi::_2, qi::_2, qi::_1)];
             timeBound.name("time bound");
             
             timeBounds = (timeBound % qi::lit(",")) | (((-qi::lit("^") >> qi::lit("{")) >> (timeBound % qi::lit(","))) >> qi::lit("}"));