fix bug in range function.

Author: DarioRoman01

src/builtins.go

@@ -157,7 +157,7 @@ func rango(args ...Object) Object {
 		}
 
 		list := &List{Values: []Object{}}
-		for i := 0; i <= num.Value; i++ {
+		for i := 0; i < num.Value; i++ {
 			list.Values = append(list.Values, &Number{i})
 		}
 		return list

tests/evaluator_test.go

@@ -240,10 +240,10 @@ func (e *EvaluatorTests) TestWhileLoop() {
 
 func (e *EvaluatorTests) TestForLoop() {
 	tests := []tuple{
-		{`var i = 0; por(n en rango(10)) { i = i + 1; }; i;`, 11},
-		{`var i = 0; por(n en rango(3)) { i = i + 1; }; i;`, 4},
-		{`var i = 0; por(n en rango(5)) { i = i + 1; }; i;`, 6},
-		{`var i = 0; por(n en rango(4)) { i = i + 1; }; i;`, 5},
+		{`var i = 0; por(n en rango(10)) { i = i + 1; }; i;`, 10},
+		{`var i = 0; por(n en rango(3)) { i = i + 1; }; i;`, 3},
+		{`var i = 0; por(n en rango(5)) { i = i + 1; }; i;`, 5},
+		{`var i = 0; por(n en rango(4)) { i = i + 1; }; i;`, 4},
 	}
 
 	for _, test := range tests {