public async Task RequestDiags(string code, int generation)
{
await DoCancellableAction(async (token) =>
{
var diags = await ideServices.GetDiagnosticsAsyc(code, token);
// If cancelled, then don't bother sending details back to the client
token.ThrowIfCancellationRequested();
Clients.Caller.DiagsCallback(diags == null ? null : CompilerError.ArrayFromDiagnostics(diags), generation);
}, Context.ConnectionId, inProgressDiags);
}