fix handling of multiline comments

src/main/jastadd/RelAst.flex

@@ -36,7 +36,7 @@ import org.jastadd.relast.parser.RelAstParser.Terminals;
 %}
 
 WhiteSpace = [ ] | \t | \f | \n | \r | \r\n
-TraditionalComment   = "/*" [^*] ~"*/" | "/*" "*"+ "/"
+TraditionalComment   = [/][*][^*]*[*]+([^*/][^*]*[*]+)*[/]
 EndOfLineComment = "//" [^\n|\r|\r\n]*
 Comment = {TraditionalComment} | {EndOfLineComment}
 

src/test/jastadd/relations/Relations.relast

+// do line comments work?
+
 Root ::= A* B*;
 A ::= <Name> /SomeNTA:A/;
 B ::= <Name>;
@@ -6,6 +8,23 @@ rel A.Di1  -> B;
 rel A.Di2? -> B;
 rel A.Di3* -> B;
 
+/*
+  do multiline comments work
+*/
+
+/**/
+
+/*
+ * work?
+*/
+
+/**
+ * The root of a Java AST.
+ *
+ * <p>A Java program consists of multiple compilation units that represent the
+ * source files of the program.
+ */
+
 rel A.Bi1 <-> B.Bi1;
 rel A.Bi2 <-> B.Bi2?;
 rel A.Bi3 <-> B.Bi3*;