Fehlerbehandlung in xax verbessert;

dafür muss eine Warnung in Kauf genommen werden.

src/xax.y

@@ -28,6 +28,7 @@ vector<CTree*>* vtree;
 %debug
 
 %{
+#define YYERROR_VERBOSE 1
 #define YYPARSE_PARAM T       /* used via xaxparse( CTree *T ) */
 int xaxerror(const char*);    /* provided by calling code (expr.cpp, ...) */
 int xaxlex(YYSTYPE *xaxlval); /* created by lex.l */
@@ -60,14 +61,7 @@ int xaxlex(YYSTYPE *xaxlval); /* created by lex.l */
 
 %%
 input: 
-        /* empty */        { printf("pars got empty line\n"); }
-      | line
-;
-
-line:
-        exp END            { *((CTree*)T) = *$1;
-	                     delete $1;
-		             return 0; }
+        exp END            { *((CTree*)T) = *$1; delete $1; return 0; }
       | error              { yyerrok; return -1; }
 ;