Remove some unused locals (dotnet/corefx#39956)

* Remove some unused locals

Trying out various analyzers, including one to flag unused locals.  There are more than this, but this is a first batch.  Some of these are just clean-up.  Others are saving unnecessary cost.  At least one appears to be a real functional bug.

* Address PR feedback

Signed-off-by: dotnet-bot <dotnet-bot@microsoft.com>

2 files changed, 3 insertions, 3 deletions

diff --git a/netcore/System.Private.CoreLib/shared/System/Resources/ResourceReader.cs b/netcore/System.Private.CoreLib/shared/System/Resources/ResourceReader.cs
index 55b6d77f03b..c0b2f5d4a9d 100644
--- a/netcore/System.Private.CoreLib/shared/System/Resources/ResourceReader.cs
+++ b/netcore/System.Private.CoreLib/shared/System/Resources/ResourceReader.cs
@@ -869,7 +869,7 @@ namespace System.Resources
                     // Skip over the array of nameHashes.
                     _ums.Seek(seekPos, SeekOrigin.Current);
                     // get the position pointer once more to check that the whole table is within the stream
-                    byte* junk = _ums.PositionPointer;
+                    _ = _ums.PositionPointer;
                 }
             }
 
@@ -901,7 +901,7 @@ namespace System.Resources
                     // Skip over the array of namePositions.
                     _ums.Seek(seekPos, SeekOrigin.Current);
                     // get the position pointer once more to check that the whole table is within the stream
-                    byte* junk = _ums.PositionPointer;
+                    _ = _ums.PositionPointer;
                 }
             }
 
diff --git a/netcore/System.Private.CoreLib/shared/System/Threading/Tasks/ConcurrentExclusiveSchedulerPair.cs b/netcore/System.Private.CoreLib/shared/System/Threading/Tasks/ConcurrentExclusiveSchedulerPair.cs
index 20a375135cc..5939d09047b 100644
--- a/netcore/System.Private.CoreLib/shared/System/Threading/Tasks/ConcurrentExclusiveSchedulerPair.cs
+++ b/netcore/System.Private.CoreLib/shared/System/Threading/Tasks/ConcurrentExclusiveSchedulerPair.cs
@@ -654,7 +654,7 @@ namespace System.Threading.Tasks
                 catch
                 {
                     Debug.Assert(t.IsFaulted, "Task should be faulted due to the scheduler faulting it and throwing the exception.");
-                    var ignored = t.Exception;
+                    _ = t.Exception;
                     throw;
                 }
                 finally { t.Dispose(); }