diff --git a/evaluator/evaluator.go b/evaluator/evaluator.go
index 438ce33..1fac4ef 100644
--- a/evaluator/evaluator.go
+++ b/evaluator/evaluator.go
@@ -45,14 +45,6 @@ func isError(obj object.Object) bool {
 	return false
 }
 
-func isNil(obj object.Object) bool {
-	return obj == Nil
-}
-
-func isSymbol(obj object.Object) bool {
-	return obj.Type() == object.SYMBOL_OBJ
-}
-
 func evalProgram(program *ast.Program, env *object.Environment) object.Object {
 	var result object.Object
 
diff --git a/repl/repl.go b/repl/repl.go
index a3d96d3..90f5fa6 100644
--- a/repl/repl.go
+++ b/repl/repl.go
@@ -36,8 +36,8 @@ func Start(in io.Reader, out io.Writer) {
 
 		evaluated := evaluator.Eval(program, env)
 		if evaluated != nil {
-			io.WriteString(out, evaluated.Inspect())
-			io.WriteString(out, "\n")
+			_, _ = io.WriteString(out, evaluated.Inspect())
+			_, _ = io.WriteString(out, "\n")
 		}
 	}
 }