Positional parameters being placed after named parameters causes compilation error

[youssef-attia]

What happened?

I expected DartPad to accept positional parameters being placed in any order with named parameters but this is not the case.

Steps to reproduce problem

The minimum case to reproduce the error is:

import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const Text(key: Key('hello'), 'hello',);
  }
}

The errors that DartPad returns is:
"Error compiling to JavaScript:
/tmp/dartpadUTEEFM/lib/main.dart:10:18: Error: Constant evaluation error:
return const Text(key: Key('hello'), 'hello');
^
/tmp/dartpadUTEEFM/lib/main.dart:10:28: Context: The variable '(unnamed)' is not a constant, only constant expressions are allowed.
return const Text(key: Key('hello'), 'hello');"

The error can be fixed by changing the line: return const Text(key: Key('hello'), 'hello',); to return const Text('hello', key: Key('hello'),);

[johnpryan]

This should be allowed now that this feature has shipped in 2.17: dart-lang/language#1072. Feel free to comment and we will reopen if you're still seeing an issue with this.