public void UpdateParseResult(Uri uri, ParseResult parserResult)
{
DocumentLastParseResults.AddOrUpdate(uri, parserResult, (u, oldParse) => parserResult);
var lookup = parserResult.EnumerateSymbols()
.ToLookup(c => c.Name, StringComparer.OrdinalIgnoreCase);
documentSymbolsLookup.AddOrUpdate(uri, lookup, (key, old) => lookup);
UpdateSymbolCompletions(uri);
}