Using a RaisedButton in a non-material app doesn't hint as to what is wrong #243

Issue by sethladd
Thursday Oct 29, 2015 at 22:28 GMT
Originally opened as https://github.com/flutter/engine/issues/1878

Consider this code:

import 'package:flutter/material.dart';

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessComponent {
  Widget build(BuildContext context) {
    return new Column([
      new Center(child: new Text("first")),
      new Center(child: new Text("second")),
      new Center(child: new RaisedButton(child: new Text("third")))
    ], justifyContent: FlexJustifyContent.spaceAround);
  }
}

There are no warnings or errors. It launches correctly on the phone (from what I can tell)

Expected: the button is displayed, or some error telling me why this isn't allowed
Actual: I see "first", and "second", but not a button for "third"

If this is not valid code, could we error out with a message, or provide some feedback somehow (even on the screen) that lets the developer know what's wrong?

Thanks!