5164ecd5ec
http://dartbug.com/51179 - the defaulted value of `s1` is `null` instead of the correct string `'default value'`. Bug: 51179 Change-Id: I437d95d8a4a273fd014a005f6c40a9be05f45d2a Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/280138 Reviewed-by: Mayank Patke <fishythefish@google.com> Commit-Queue: Stephen Adams <sra@google.com>