Issue with program containing Float32List

[Fox32]

What happened?

I created the following program in Dart Pad:

import 'dart:typed_data' ;
import 'dart:math';

extension type Vector3(Float32List storage) {
  
  Vector3.zero() : storage = new Float32List.fromList([0.0, 0.0, 0.0]);
    
  double get length => sqrt(storage[0] * storage[0] + storage[1] * storage[1] + storage[2] * storage[2]);
  
}

void main() {
  final v0 = new Vector3.zero();
    
   print(v0.length);
}

It runs with the Dart VM on Dart SDK version: 3.3.1 (stable) (Wed Mar 6 13:09:19 2024 +0000) on "macos_arm64" . However it fails with an error in Dart Pad:

Uncaught TypeError: typed_data.Float32List.fromList is not a function, error: TypeError: typed_data.Float32List.fromList is not a function

Steps to reproduce problem

1. Paste the code above
2. Press run

Additional info

Browser

Browser: Chrome

Version: Based on Dart SDK 3.0.0 and Flutter SDK 3.19.2

Are you using any extensions/plugins that affect website behavior
(particularly those that affect iframes, such as ad blockers)?

Are there any warnings or errors in your browser's JavaScript console?
If so, paste them below:

VM302:64 Uncaught TypeError: typed_data.Float32List.fromList is not a function
    at Object.Vector3$124constructor$35zero [as Vector3|constructor#zero] (<anonymous>:64:40)
    at Object.main$0 [as main] (<anonymous>:74:46)
    at Object.main$ [as main] (<anonymous>:54:10)
    at <anonymous>:113:26
    at Object.execCb (require.js:5:16727)
    at e.check (require.js:5:10499)
    at e.<anonymous> (require.js:5:12915)
    at require.js:5:1542
    at require.js:5:13376
    at each (require.js:5:1020)
    at e.emit (require.js:5:13344)
    at e.check (require.js:5:11058)
    at e.enable (require.js:5:13242)
    at e.init (require.js:5:9605)
    at a (require.js:5:8305)
    at Object.completeLoad (require.js:5:15962)
    at HTMLScriptElement.onScriptLoad (require.js:5:16882)

Machine

Operating system: MacOS

Version: 13.4

Your code

What code was in the editor, if any, when the failure occurred? You
can paste it in below:

import 'dart:typed_data' ;
import 'dart:math';

extension type Vector3(Float32List storage) {
  
  Vector3.zero() : storage = new Float32List.fromList([0.0, 0.0, 0.0]);
    
  double get length => sqrt(storage[0] * storage[0] + storage[1] * storage[1] + storage[2] * storage[2]);
  
}

void main() {
  final v0 = new Vector3.zero();
    
   print(v0.length);
}

DartPad's output

Did DartPad print anything to the console pane? If so, paste it below:

Uncaught TypeError: typed_data.Float32List.fromList is not a function, error: TypeError: typed_data.Float32List.fromList is not a function

If you were running Flutter code, you can also paste an image of the
Flutter output directly into this bug report.

[cmkweber]

dart-lang/sdk#55135

This was a dart issue related to forwarding constructors, it was cherry picked but hasn’t made it to dart pad yet.

[Fox32]

Thanks for letting me know, than it will probably land soon 🙂