https://dart-review.googlesource.com/c/sdk/+/498840 added support for
promotion of properties (private, final instance variables with a name
which isn't used much for other purposes) in the context of anonymous
methods.
This CL reduces the set of situations where this feature is enabled such
that only `this` will allow property promotions to be carried in (such
that `this._x` is promoted in `v.=> this._x` when `v` is such that
`v._x` has been promoted before the anonymous method occurs). It also
generalizes the mechanism such that property promotions are carried out
(so we can do `if (v.=> _x is int) v._x.isEven;`).
Tests has been adjusted accordingly.
Change-Id: Ibe70713d3d9c89a6d95f9c3dd28df8f147cb518d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/502660
Reviewed-by: Paul Berry <paulberry@google.com>
Commit-Queue: Erik Ernst <eernst@google.com>
Erik Ernst
96a4dd4c19