The test tries to keep fields alive by my making a
toString() => field1 + field2 + ...
Though some field values don't have a `+` operator (e.g. instances of `class C`).
Improving TFA precision can infer that some of these `+` operations will throw,
which then makes other `+` operations unreachable, which removes usages
of those other fields, which will tree shake those other fields, which
will make the test not test anymore what it's intended to.
=> Make the test more robust by using string concatenation instead.
Change-Id: I80788af516083ea3d78ad910eb394e4b7e122384
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/507000
Reviewed-by: Slava Egorov <vegorov@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>
Martin Kustermann
2198d25b1e