5a9418bfbf
Directive introduced in https://github.com/dart-lang/dartdoc/pull/3398 but not documented yet. Still experimental, but used by Flutter. Change-Id: I277927a54caf926b0b3d13db589486465ab9358d Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/328180 Commit-Queue: Samuel Rawlins <srawlins@google.com> Reviewed-by: Phil Quitslund <pquitslund@google.com>