Unnecessary reference to unsound null safety #74366
Description
When rebuilding the Flutter tool, Flutter prints an informational message to the console that the tool is compiled with unsound null safety. This is unnecessary friction, since it seems like a warning to the developer, but they can't do anything about it. We should mute this message (e.g. by passing a --silent flag).
$ flutter upgrade
Upgrading Flutter to 1.26.0-2.0.pre.442 from 1.26.0-2.0.pre.440 in /Users/timsneath/flutter...
Building flutter tool...
Info: Compiling with unsound null safety
Upgrading engine...
Flutter 1.26.0-2.0.pre.442 • channel master • [email protected]:flutter/flutter.git
Framework • revision 97481e125a (16 minutes ago) • 2021-01-20 17:44:02 -0600
Engine • revision 0c79393dde
Tools • Dart 2.12.0 (build 2.12.0-240.0.dev)
etc.