Parser doesn't allow "late" as an identifier

[munificent]

Take this:

main() {
  var foo;
  var bar = foo.late;
}

Run it with:

$ dart --enable-experiment=non-nullable temp.dart

Output:

temp.dart:3:17: Error: Expected an identifier, but got 'late'.
  var bar = foo.late;
                ^^^^

I believe that's incorrect. With NNBD, late is a built-in identifier. It can't be used as an identifier in some contexts (prefix?), but in most places it's a valid identifier, just like get, set, hide, etc.

[bwilkerson]

@jensjoha

[eernstg]

With NNBD, late is a built-in identifier.

Right, and that means that it cannot be 'the declared name of a prefix, class, mixin, type parameter, or type alias'. In return for that, the parser can decide upon seeing late that it isn't looking at a type. But it can be the name of a class member and other non-type things.

[davidmorgan]

Thanks everyone. This is blocking use of extension methods in google3; please treat as high priority if possible :)

[jensjoha]

Should be fixed with https://dart-review.googlesource.com/c/sdk/+/121120/.