private async Task DumpFormatAsync(ExpressionViewModel vm, string msg) =>
//if ()
//{
// return ;
//}
//var retVal = SerializingFormatter.Format(
// Interpreter,
// true,
// Interpreter.GetReturnValue(),
// ignoreNull: false,
// ignoreClrObj: false,
// scopes: AphidObject.GetScopeAncestors(Interpreter.CurrentScope));
//return CodeViewer.Run(() => vm.Value = retVal);
await CodeViewer.Run(
x => vm.Value = x,
await(msg != null ?
(Func <Task <string> >)(() => Task.FromResult(msg)) :
(() => Task.Run(
() => SerializingFormatter.Format(
Interpreter,
true,
Interpreter.GetReturnValue(),
ignoreNull: false,
ignoreClrObj: false,
scopes: AphidObject
.GetScopeAncestors(Interpreter.CurrentScope)))))());