Index: polemy/eval.d
==================================================================
--- polemy/eval.d
+++ polemy/eval.d
@@ -45,10 +45,26 @@
 			throw new PolemyRuntimeException("/ takes two arguments!! ["~to!string(pos)~"]");
 		if( auto x = cast(IntValue)args[0] )
 			if( auto y = cast(IntValue)args[1] )
 				return new IntValue(x.data/y.data);
 		throw new PolemyRuntimeException("cannot add non-integers ["~to!string(pos)~"]");
+	}));
+	ctx.add("<", new FunValue(delegate Value(immutable LexPosition pos, Value[] args){
+		if( args.length != 2 )
+			throw new PolemyRuntimeException("< takes two arguments!! ["~to!string(pos)~"]");
+		if( auto x = cast(IntValue)args[0] )
+			if( auto y = cast(IntValue)args[1] )
+				return new IntValue(BigInt(to!int(x.data < y.data)));
+		throw new PolemyRuntimeException("cannot add non-integers ["~to!string(pos)~"]");
+	}));
+	ctx.add(">", new FunValue(delegate Value(immutable LexPosition pos, Value[] args){
+		if( args.length != 2 )
+			throw new PolemyRuntimeException("> takes two arguments!! ["~to!string(pos)~"]");
+		if( auto x = cast(IntValue)args[0] )
+			if( auto y = cast(IntValue)args[1] )
+				return new IntValue(BigInt(to!int(x.data>y.data)));
+		throw new PolemyRuntimeException("cannot add non-integers ["~to!string(pos)~"]");
 	}));
 	ctx.add("print", new FunValue(delegate Value(immutable LexPosition pos, Value[] args){
 		foreach(a; args)
 			write(a);
 		writeln("");
@@ -203,6 +219,13 @@
 			{ x*fac(x-1); }
 		else
 			{ 1; };
 	};
 	print(fac(10));`);
+	evalString(`var fib = fun(x){
+		if(x<2)
+			{ 1; }
+		else
+			{ fib(x-1) + fib(x-2); };
+	};
+	print(fib(10));`);
 }