Add `using System.Diagnostics.Private;` to TimeSpan*.cs

2 files changed, 14 insertions, 2 deletions

diff --git a/src/Common/src/CoreLib/System/Globalization/TimeSpanFormat.cs b/src/Common/src/CoreLib/System/Globalization/TimeSpanFormat.cs
index a66e4600aa..075f1eae3a 100644
--- a/src/Common/src/CoreLib/System/Globalization/TimeSpanFormat.cs
+++ b/src/Common/src/CoreLib/System/Globalization/TimeSpanFormat.cs
@@ -4,6 +4,7 @@
 
 using System.Text;
 using System.Diagnostics;
+using System.Diagnostics.Private;
 using System.Runtime.InteropServices;
 
 namespace System.Globalization
@@ -316,7 +317,17 @@ namespace System.Globalization
                         if (nextChar >= 0 && nextChar != (int)'%')
                         {
                             char nextCharChar = (char)nextChar;
-                            StringBuilder origStringBuilder = FormatCustomized(value, MemoryMarshal.CreateReadOnlySpan<char>(ref nextCharChar, 1), dtfi, result);
+                            ReadOnlySpan<char> nextCharSpan;
+#if MONO
+                            // Remove once Mono switches to Fast Spans
+                            unsafe 
+                            {
+                                nextCharSpan = new ReadOnlySpan<char>(&nextCharChar, 1);
+                            }
+#else
+                            nextCharSpan = MemoryMarshal.CreateReadOnlySpan<char>(ref nextCharChar, 1);
+#endif
+                            StringBuilder origStringBuilder = FormatCustomized(value, nextCharSpan, dtfi, result);
                             Debug.Assert(ReferenceEquals(origStringBuilder, result));
                             tokenLen = 2;
                         }
diff --git a/src/Common/src/CoreLib/System/Globalization/TimeSpanParse.cs b/src/Common/src/CoreLib/System/Globalization/TimeSpanParse.cs
index 51fac39d0a..c6475e02d9 100644
--- a/src/Common/src/CoreLib/System/Globalization/TimeSpanParse.cs
+++ b/src/Common/src/CoreLib/System/Globalization/TimeSpanParse.cs
@@ -49,11 +49,12 @@
 ////////////////////////////////////////////////////////////////////////////
 
 using System.Diagnostics;
+using System.Diagnostics.Private;
 using System.Text;
 
 namespace System.Globalization
 {
-    internal static class TimeSpanParse
+    internal static partial class TimeSpanParse
     {
         private const int MaxFractionDigits = 7;
         private const int MaxDays = 10675199;