Unfortunately my idea about checking for specific `DartType` subtype,
and only then asking for the element is too punitive. It almost
works in google3, but the amount and the kind of changes I had to
do make me realize that we should keep `get elementX` in `DartType`.
I guess this is the same as we had in AST when `get constructors`
does not make sense for mixins (?), but works for classes and enums,
and it is easier to pull it into the superclass.
Change-Id: Ibc4fac0b95d63748fa65de96d29300f477fdfc76
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/254482
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
Konstantin Shcheglov
82e33cc598