Package imports and relative imports don't resolve to the same type anymore

[enyo]

Dart VM version: 2.0.0-dev.69.0 (Tue Jul 17 14:57:16 2018 +0200) on "macos_x64"
macOS mojave

When to different files include the same file, once with import "package:mylib/test.dart"; and once with import "test.dart"; the dart runtime doesn't recognise the classes to be identical anymore.

// lib/test.dart
class Foo {
}

// lib/a.dart
import 'test.dart';
Foo getFoo() => new Foo();

// lib/b.dart
import 'package:mylib/test.dart';
import 'a.dart';

main() {
  Foo foo = getFoo(); // This fails
}

Error:

Error: A value of type '#lib1::Foo' can't be assigned to a variable of type '#lib2::Foo'.
Try changing the type of the left hand side, or casting the right hand side to '#lib2::Foo'.

[zoechi]

dup of #33076