Allow multiple class{} blocks for same class if in same file (so we can have constructors in part files)

[gisborne]

Many folks try to maintain short files. I often use Dart's part feature for this.

But if I have what would otherwise be a large class, I am limited in my ability to do this. In particular, all constructors must be in the main file.

So if I have multiple, complex constructors, my file gets big and I have no real way to mitigate this.

It would be useful if I can declare the components of a class in multiple files. The simple way to do this is to have multiple declarations of the same class in the same "file".

This sort of thing.

//foo.dart

part "foo_constructor.dart";

class Foo{
  Foo._(){}
}

//foo_constructor.dart

part_of "foo.dart";

class Foo{
  Foo() : Foo._();
}

[mateusfccp]

Isn't this basically the same as augmentation libraries?

[lrhn]

Or partial classes (#252), which augmentations is intended as a solution for.

Closing as duplicate of either.