Fix CLI rename-symbol support for top-level statement

src/CSharp.Workspaces/CSharp/FindSymbols/LocalSymbolFinder.cs

@@ -2,6 +2,7 @@
 
 using System.Collections.Immutable;
 using System.Diagnostics;
+using System.Linq;
 using System.Threading;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
@@ -102,6 +103,15 @@ public static ImmutableArray<ISymbol> FindLocalSymbols(
                 walker.Visit(declaration.BodyOrExpressionBody());
                 break;
             }
+            case SyntaxKind.CompilationUnit:
+            {
+                var declaration = (CompilationUnitSyntax)node;
+                foreach (GlobalStatementSyntax globalStatement in declaration.Members.OfType<GlobalStatementSyntax>())
+                {
+                    walker.Visit(globalStatement);
+                }
+                break;
+            }
             case SyntaxKind.Parameter:
             case SyntaxKind.RecordDeclaration:
             {

src/Workspaces.Core/Rename/SymbolListHelpers.cs

@@ -93,7 +93,7 @@ public static List<ISymbol> SortAndFilterMemberSymbols(IEnumerable<ISymbol> symb
                     results.Add(symbol);
 
                 results.AddRange(methodSymbol.TypeParameters);
-                results.AddRange(methodSymbol.Parameters);
+                results.AddRange(methodSymbol.Parameters.Where(ms => !ms.IsImplicitlyDeclared));
             }
             else
             {