From 0ca92d5a720f6149e86175db8347e06aca055141 Mon Sep 17 00:00:00 2001
From: hypnos <hypnos@yandex-team.ru>
Date: Tue, 19 Jul 2016 00:19:35 +0300
Subject: [PATCH] Make `MemoryStream#remember` a true bypass

---
 src/core.ts                | 4 ++++
 tests/operator/remember.ts | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/src/core.ts b/src/core.ts
index 6759401..4bdeb81 100644
--- a/src/core.ts
+++ b/src/core.ts
@@ -1929,6 +1929,10 @@ export class MemoryStream<T> extends Stream<T> {
     return <MemoryStream<T>> super.replaceError(replace);
   }
 
+  remember(): MemoryStream<T> {
+    return this;
+  }
+
   debug(labelOrSpy?: string | ((t: T) => void)): MemoryStream<T> {
     return <MemoryStream<T>> super.debug(labelOrSpy);
   }
diff --git a/tests/operator/remember.ts b/tests/operator/remember.ts
index 9bc19ec..49abe33 100644
--- a/tests/operator/remember.ts
+++ b/tests/operator/remember.ts
@@ -121,6 +121,13 @@ describe('Stream.prototype.remember', () => {
     done();
   });
 
+  it('should be a true bypass if input stream is a MemoryStream', (done) => {
+    const input = xs.createWithMemory<number>();
+    const stream: MemoryStream<number> = input.remember();
+    assert.strictEqual(stream, input);
+    done();
+  });
+
   it('should not fail if original memorystream has no producer, and start is called', (done) => {
     const input = xs.createWithMemory<number>();
     assert.strictEqual(input instanceof MemoryStream, true);