simplify

src/Features/Core/Portable/EmbeddedLanguages/RegularExpressions/RegexParser.cs

@@ -1237,7 +1237,7 @@ private RegexBaseCharacterClassNode ParseCharacterClass()
             // trivia is not allowed anywhere in a character class
             ConsumeCurrentToken(allowTrivia: false);
 
-            using var _ = ArrayBuilder<RegexExpressionNode>.GetInstance(out var builder);
+            using var _1 = ArrayBuilder<RegexExpressionNode>.GetInstance(out var builder);
             while (_currentToken.Kind != RegexKind.EndOfFile)
             {
                 Debug.Assert(_currentToken.VirtualChars.Length == 1);
@@ -1255,7 +1255,7 @@ private RegexBaseCharacterClassNode ParseCharacterClass()
             // We wil commonly get tons of text nodes in a row.  For example, the
             // regex `[abc]` will be three text nodes in a row.  To help save on memory
             // try to merge that into one single text node.
-            using var _ = ArrayBuilder<RegexExpressionNode>.GetInstance(out var contents);
+            using var _2 = ArrayBuilder<RegexExpressionNode>.GetInstance(out var contents);
             MergeTextNodes(builder, contents);
 
             if (closeBracketToken.IsMissing)

src/Features/Core/Portable/MoveToNamespace/AbstractMoveToNamespaceCodeAction.cs

@@ -59,7 +59,7 @@ private static ImmutableArray<CodeActionOperation> CreateRenameOperations(MoveTo
         {
             Debug.Assert(moveToNamespaceResult.Succeeded);
 
-            using var = PooledObjects.ArrayBuilder<CodeActionOperation>.GetInstance(out var operations);
+            using var _ = PooledObjects.ArrayBuilder<CodeActionOperation>.GetInstance(out var operations);
             operations.Add(new ApplyChangesOperation(moveToNamespaceResult.UpdatedSolution));
 
             var symbolRenameCodeActionOperationFactory = moveToNamespaceResult.UpdatedSolution.Workspace.Services.GetService<ISymbolRenamedCodeActionOperationFactoryWorkspaceService>();