1 files changed, 7 insertions, 8 deletions
diff --git a/src/System.Private.CoreLib/shared/System/Threading/Tasks/TaskCanceledException.cs b/src/System.Private.CoreLib/shared/System/Threading/Tasks/TaskCanceledException.cs
index c3ee31a53c..5147f116eb 100644
--- a/src/System.Private.CoreLib/shared/System/Threading/Tasks/TaskCanceledException.cs
+++ b/src/System.Private.CoreLib/shared/System/Threading/Tasks/TaskCanceledException.cs
@@ -10,8 +10,7 @@
 //
 // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 
-using System;
-using System.Runtime.InteropServices;
+#nullable enable
 using System.Runtime.Serialization;
 
 namespace System.Threading.Tasks
@@ -24,7 +23,7 @@ namespace System.Threading.Tasks
     public class TaskCanceledException : OperationCanceledException
     {
         [NonSerialized]
-        private readonly Task _canceledTask; // The task which has been canceled.
+        private readonly Task? _canceledTask; // The task which has been canceled.
 
         /// <summary>
         /// Initializes a new instance of the <see cref="T:System.Threading.Tasks.TaskCanceledException"/> class.
@@ -38,7 +37,7 @@ namespace System.Threading.Tasks
         /// class with a specified error message.
         /// </summary>
         /// <param name="message">The error message that explains the reason for the exception.</param>
-        public TaskCanceledException(string message) : base(message)
+        public TaskCanceledException(string? message) : base(message)
         {
         }
 
@@ -49,7 +48,7 @@ namespace System.Threading.Tasks
         /// </summary>
         /// <param name="message">The error message that explains the reason for the exception.</param>
         /// <param name="innerException">The exception that is the cause of the current exception.</param>
-        public TaskCanceledException(string message, Exception innerException) : base(message, innerException)
+        public TaskCanceledException(string? message, Exception? innerException) : base(message, innerException)
         {
         }
 
@@ -61,7 +60,7 @@ namespace System.Threading.Tasks
         /// <param name="message">The error message that explains the reason for the exception.</param>
         /// <param name="innerException">The exception that is the cause of the current exception.</param>
         /// <param name="token">The <see cref="CancellationToken"/> that triggered the cancellation.</param>
-        public TaskCanceledException(string message, Exception innerException, CancellationToken token) : base(message, innerException, token)
+        public TaskCanceledException(string? message, Exception? innerException, CancellationToken token) : base(message, innerException, token)
         {
         }
 
@@ -70,7 +69,7 @@ namespace System.Threading.Tasks
         /// with a reference to the <see cref="T:System.Threading.Tasks.Task"/> that has been canceled.
         /// </summary>
         /// <param name="task">A task that has been canceled.</param>
-        public TaskCanceledException(Task task) :
+        public TaskCanceledException(Task? task) :
             base(SR.TaskCanceledException_ctor_DefaultMessage, task != null ? task.CancellationToken : new CancellationToken())
         {
             _canceledTask = task;
@@ -94,6 +93,6 @@ namespace System.Threading.Tasks
         /// <see cref="T:System.Threading.Tasks.TaskCanceledException"/>, in which case
         /// this property will return null.
         /// </remarks>
-        public Task Task => _canceledTask;
+        public Task? Task => _canceledTask;
     }
 }