Decide if unit without directives is a part or a library.

pkg/analyzer/lib/src/task/dart.dart

Index: pkg/analyzer/lib/src/task/dart.dart
diff --git a/pkg/analyzer/lib/src/task/dart.dart b/pkg/analyzer/lib/src/task/dart.dart
index c4f2dfcbb44e1c96473bb913bd92119f14c73e4c..dde0ebce7e37ca7e25abbe9850eb81508fc29a3a 100644
--- a/pkg/analyzer/lib/src/task/dart.dart
+++ b/pkg/analyzer/lib/src/task/dart.dart
@@ -2671,8 +2671,16 @@ class ParseDartTask extends SourceBasedAnalysisTask {
     SourceKind sourceKind = SourceKind.LIBRARY;
     if (modificationTime == -1) {
       sourceKind = SourceKind.UNKNOWN;
-    } else if (!hasNonPartOfDirective && hasPartOfDirective) {
+    } else if (hasNonPartOfDirective) {
+      sourceKind = SourceKind.LIBRARY;
+    } else if (hasPartOfDirective) {
       sourceKind = SourceKind.PART;
+    } else {
+      if (context.getLibrariesContaining(source).isEmpty) {

[Brian Wilkerson, 2015/06/02 22:01:53]

While this is better, it doesn't work reliably. If we choose to parse the part
file before we parse the including library we'll incorrectly assume that it's a
library (rather than the part it really is).

I'm not sure what the right solution is, though.

[scheglov, 2015/06/02 22:56:41]

Right.
That's there is also the change in DartWorkManager.
If we detect that the source is a part of a library, we change its SOURCE_KIND
and remove LibrarySpecificUnit(part, part).

+        sourceKind = SourceKind.LIBRARY;
+      } else {
+        sourceKind = SourceKind.PART;
+      }
     }
     //
     // Record outputs.