Fix SyntaxErrorCharExpectedCodeFixProvider.

src/CodeFixes/CSharp/CodeFixes/SyntaxErrorCharExpectedCodeFixProvider.cs

@@ -25,13 +25,13 @@ public sealed override ImmutableArray<string> FixableDiagnosticIds
  public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
  {
  if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.AddMissingComma))
- {
  return;
- }
 
  SyntaxNode root = await context.GetSyntaxRootAsync().ConfigureAwait(false);
 
- if (!TryFindNode(root, context.Span, out InitializerExpressionSyntax initializer))
+ ExpressionSyntax expression = root.FindNode(context.Span).FirstAncestorOrSelf<ExpressionSyntax>();
+
+ if (expression == null)
  return;
 
  foreach (Diagnostic diagnostic in context.Diagnostics)
@@ -43,12 +43,14 @@ public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
  if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.AddMissingComma))
  break;
 
- if (!initializer.IsKind(SyntaxKind.ArrayInitializerExpression))
+ if (!expression.IsParentKind(SyntaxKind.ArrayInitializerExpression))
  break;
 
+ var initializer = (InitializerExpressionSyntax)expression.Parent;
+
  SeparatedSyntaxList<ExpressionSyntax> expressions = initializer.Expressions;
 
- int index = expressions.IndexOf(initializer);
+ int index = expressions.IndexOf(expression);
 
  SyntaxToken comma = expressions.GetSeparator(index);
 
@@ -62,7 +64,7 @@ public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
  "Add missing comma",
  cancellationToken =>
  {
- var textChange = new TextChange(new TextSpan(initializer.Span.End, 0), ",");
+ var textChange = new TextChange(new TextSpan(expression.Span.End, 0), ",");
  return context.Document.WithTextChangeAsync(textChange, cancellationToken);
  },
  GetEquivalenceKey(diagnostic));