Exceptions only show type name and not actual useful exception information

Repro steps:

1. Enable Dart 2 preview modfe
2. Create new Flutter ap
3. Replace main.dart with the contents belowe
4. Run

=> program breaks on a _TypeError, and the debug console says: breaking at exception: _TypeError

Can we have an easier to understand error message?

Also, we should provide more information on what failed. If you try the same in IntelliJ or from the terminal, you get:

type 'String' is not a subtype of type 'int' of 'function result' where
  String is from dart:core
  int is from dart:core

main.dart:

import 'package:flutter/material.dart';
import 'dart:convert';

int lowestPrice() {
  List<int> prices = JSON.decode('["7", "100", "500"]');
  prices.sort();
  return prices[0];
}

void main() => runApp(new MyApp(lowestPrice()));

class MyApp extends StatelessWidget {
  final int lp;
  MyApp(this.lp);

  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      home: new Scaffold(
        appBar: new AppBar(),
        body: new Text('Lowest price $lp'),
      ),
    );
  }
}

[DanTup]

I’ll open another issue about inserted into locals, but the exception info now shows the string:

[devoncarew]

Looks great!