Set LibraryElement.entryPoint properly during summary resynthesis.

pkg/analyzer/lib/src/summary/resynthesize.dart

Index: pkg/analyzer/lib/src/summary/resynthesize.dart
diff --git a/pkg/analyzer/lib/src/summary/resynthesize.dart b/pkg/analyzer/lib/src/summary/resynthesize.dart
index 9771f0205a86c639bcdf4852641d7aca289cd7d0..e29c65fe07feb43e783704e0bbf530d6d5709bf7 100644
--- a/pkg/analyzer/lib/src/summary/resynthesize.dart
+++ b/pkg/analyzer/lib/src/summary/resynthesize.dart
@@ -673,10 +673,14 @@ class _LibraryResynthesizer {
           unlinkedDefiningUnit.exports[i]));
     }
     libraryElement.exports = exports;
-    populateUnit(definingCompilationUnit, 0);
+    FunctionElement entryPoint = populateUnit(definingCompilationUnit, 0);
     for (int i = 0; i < parts.length; i++) {
-      populateUnit(parts[i], i + 1);
+      FunctionElement unitEntryPoint = populateUnit(parts[i], i + 1);

[scheglov, 2016/01/08 06:17:44]

We need to check also exported libraries.

18.4 Scripts scripts:  A script is a library whose exported namespace (18.2)
includes a top-level
member named main.

[Paul Berry, 2016/01/08 18:25:57]

Oops, good catch!  I've added failing tests and a TODO comment, and I'll address
this in a follow-up CL.

+      if (entryPoint == null) {
+        entryPoint = unitEntryPoint;
+      }
     }
+    libraryElement.entryPoint = entryPoint;
     if (isCoreLibrary) {
       ClassElement objectElement = libraryElement.getType('Object');
       assert(objectElement != null);
@@ -930,8 +934,10 @@ class _LibraryResynthesizer {
   /**
    * Populate a [CompilationUnitElement] by deserializing all the elements
    * contained in it.
+   *
+   * If the compilation unit has an entry point, it is returned.
    */
-  void populateUnit(CompilationUnitElementImpl unit, int unitNum) {
+  FunctionElement populateUnit(CompilationUnitElementImpl unit, int unitNum) {
     prelinkedUnit = prelinkedLibrary.units[unitNum];
     unlinkedUnit = unlinkedUnits[unitNum];
     unitHolder = new ElementHolder();
@@ -963,9 +969,17 @@ class _LibraryResynthesizer {
     for (FunctionTypeAliasElement typeAlias in unit.functionTypeAliases) {
       elementMap[typeAlias.name] = typeAlias;
     }
+    FunctionElement entryPoint = null;
+    for (FunctionElement function in unit.functions) {
+      if (function.name == 'main') {

[scheglov, 2016/01/08 06:17:44]

Or could also use `function.isEntryPoint` instead.

[Paul Berry, 2016/01/08 18:25:57]

Done.

+        entryPoint = function;
+        break;
+      }
+    }
     resummarizedElements[absoluteUri] = elementMap;
     unitHolder = null;
     prelinkedUnit = null;
     unlinkedUnit = null;
+    return entryPoint;
   }
 }