private BoundNode BindNamespace(NamespaceSyntax declaration)
{
var enclosingNamespace = LookupEnclosingNamespace();
var namespaceSymbol = new NamespaceSymbol(declaration, enclosingNamespace);
AddSymbol(namespaceSymbol, declaration.Name.Span);
var namespaceBinder = new NamespaceBinder(_sharedBinderState, this, namespaceSymbol);
namespaceSymbol.Binder = namespaceBinder;
var boundDeclarations = namespaceBinder.BindTopLevelDeclarations(declaration.Declarations, namespaceSymbol);
foreach (var member in namespaceBinder.LocalSymbols.Values.SelectMany(x => x))
namespaceSymbol.AddMember(member);
return new BoundNamespace(namespaceSymbol, boundDeclarations);
}