Dart2: Compliance with ignored type cast failure

[matanlurey]

Currently in DDC, the following type-casts are ignored, but should fail:

List<dynamic> a = ['a', 'a', 'a'];

// Should be List<dynamic> cannot be List<String>.
List<String> b = a;

These are warnings in the development console (at runtime), but not errors. The language team is attempting to make these errors in DDC, as they will also be errors in the CFE-driven backends (eventually DDK and Dart2JS on Kernel?).

This is the master tracking issue for places in AngularDart we are violating either explicitly (in the runtime, which is easier to change) or implicitly (in the code we generate, which is more difficult to change).

I believe @leonsenft knows of some cases (with list/map literals), right?

/cc @MichaelRFairhurst @srawlins @munificent @leafpetersen.

• Template Literals Dart2: Collection literals in templates cause type cast failure #844
• QueryList (WIP) Intent to remove: QueryList #688

[matanlurey]

I'm working on #688 towards this end.

[kevmoo]

@matanlurey – can close?