Use isKnown instead of !isUnknown: if the inputs conflict, don't return automatically, but use the first input to decide for the type. We should rename isKnown and isUnknown to remove this confusion. Review URL: https://chromiumcodereview.appspot.com//9909013
Use isKnown instead of !isUnknown: if the inputs conflict, don't return automatically, but use the first input to decide for the type. We should rename isKnown and isUnknown to remove this confusion.
Review URL: https://chromiumcodereview.appspot.com//9909013

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@5972 260f80e4-7a28-3924-810f-c04153c831b5

dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk