From 7ae807e10b97f74a6090630946774b05f67ed9ab Mon Sep 17 00:00:00 2001
From: Paul Gschwendtner <paulgschwendtner@gmail.com>
Date: Tue, 13 Feb 2018 16:47:23 +0100
Subject: [PATCH] fix(list): list-options require a parent selection list
 (#9899)

Since the `MatListOption` component requires a parent `MatSelectionList`, the DI of the selection list shouldn't be optional. Otherwise there will be runtime exceptions due to an undefined selection list property.
---
 src/lib/list/selection-list.ts | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/lib/list/selection-list.ts b/src/lib/list/selection-list.ts
index 2b41800f80c..0953e826575 100644
--- a/src/lib/list/selection-list.ts
+++ b/src/lib/list/selection-list.ts
@@ -24,7 +24,6 @@ import {
   Input,
   OnDestroy,
   OnInit,
-  Optional,
   Output,
   QueryList,
   ViewChild,
@@ -164,8 +163,8 @@ export class MatListOption extends _MatListOptionMixinBase
 
   constructor(private _element: ElementRef,
               private _changeDetector: ChangeDetectorRef,
-              /** @docs-private */ @Optional() @Inject(forwardRef(() => MatSelectionList))
-              public selectionList: MatSelectionList) {
+              /** @docs-private */
+              @Inject(forwardRef(() => MatSelectionList)) public selectionList: MatSelectionList) {
     super();
   }