When there's a single symbol, it now seems to not be available in candidates

Author: GrahamTheCoder

CodeConverter/CSharp/ArgumentConverter.cs

@@ -147,7 +147,7 @@ private CSSyntax.ExpressionSyntax HoistByRefDeclaration(VBSyntax.SimpleArgumentS
     private ISymbol GetInvocationSymbol(SyntaxNode invocation)
     {
         var symbol = invocation.TypeSwitch(
-            (VBSyntax.InvocationExpressionSyntax e) => _semanticModel.GetSymbolInfo(e).CandidateSymbols
+            (VBSyntax.InvocationExpressionSyntax e) => _semanticModel.GetAllCandidateSymbols(e)
                 .OrderByDescending(s => s.GetParameters().Length == e.ArgumentList.Arguments.Count)
                 .ThenByDescending(s => ParameterMatchScore(s, e.ArgumentList.Arguments))
                 .FirstOrDefault(),

CodeConverter/Common/SharedSemanticModelExtensions.cs

@@ -13,4 +13,10 @@ public static T GetAncestorOperationOrNull<T>(this SemanticModel semanticModel,
 
         return default;
     }
+
+    public static ISymbol[] GetAllCandidateSymbols(this SemanticModel semanticModel, SyntaxNode node, CancellationToken cancellationToken = default(CancellationToken))
+    {
+        var symbolInfo = semanticModel.GetSymbolInfo(node, cancellationToken);
+        return [.. symbolInfo.Symbol.YieldNotNull(), .. symbolInfo.CandidateSymbols];
+    }
 }