49076fe6f4
Most of the fixes are to stop using `_` as an identifier now that it's a wildcard. Change-Id: I4287d12f4e664b974ad07063e21d04b2d0a61f29 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/400182 Reviewed-by: Nate Biggs <natebiggs@google.com>