From 052b652f5ed5d59000d9f61c374e349cef9f75ef Mon Sep 17 00:00:00 2001
From: Alexandre Ardhuin <alexandre.ardhuin@gmail.com>
Date: Mon, 16 Oct 2017 23:20:47 +0200
Subject: [PATCH] Optional<int>.absent() != Optional<String>.absent() (#373)

---
 lib/src/core/optional.dart   | 2 +-
 test/core/optional_test.dart | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/src/core/optional.dart b/lib/src/core/optional.dart
index d7496cce..5567147d 100644
--- a/lib/src/core/optional.dart
+++ b/lib/src/core/optional.dart
@@ -98,7 +98,7 @@ class Optional<T> extends IterableBase<T> {
   int get hashCode => _value.hashCode;
 
   /// Delegates to the underlying [value] operator==.
-  bool operator ==(o) => o is Optional && o._value == _value;
+  bool operator ==(o) => o is Optional<T> && o._value == _value;
 
   String toString() {
     return _value == null
diff --git a/test/core/optional_test.dart b/test/core/optional_test.dart
index f1a71282..46f9a7a9 100644
--- a/test/core/optional_test.dart
+++ b/test/core/optional_test.dart
@@ -99,6 +99,10 @@ main() {
       expect(new Optional<int>.of(7), equals(new Optional<int>.of(7)));
       expect(new Optional<int>.fromNullable(null),
           equals(new Optional<int>.fromNullable(null)));
+      expect(
+          new Optional<int>.fromNullable(null) ==
+              new Optional<String>.fromNullable(null),
+          isFalse);
       expect(new Optional<int>.fromNullable(null),
           isNot(equals(new Optional<int>.of(7))));
       expect(new Optional<int>.of(7), isNot(equals(new Optional<int>.of(8))));