Set LibraryElement.entryPoint properly during summary resynthesis.

pkg/analyzer/test/src/summary/resynthesize_test.dart

Index: pkg/analyzer/test/src/summary/resynthesize_test.dart
diff --git a/pkg/analyzer/test/src/summary/resynthesize_test.dart b/pkg/analyzer/test/src/summary/resynthesize_test.dart
index 26d94631bc2a1bd86fad63003346c50fcc2da842..9815eff3862765690c4a78f595f75bde190f13ca 100644
--- a/pkg/analyzer/test/src/summary/resynthesize_test.dart
+++ b/pkg/analyzer/test/src/summary/resynthesize_test.dart
@@ -64,7 +64,14 @@ class ResynthTest extends ResolverTestCase {
           'export ${original.exports[i].uri}');
     }
     expect(resynthesized.nameLength, original.nameLength);
-    // TODO(paulberry): test entryPoint, exportNamespace, publicNamespace,
+    if (original.entryPoint == null) {
+      expect(resynthesized.entryPoint, isNull);
+    } else {
+      expect(resynthesized.entryPoint, isNotNull);
+      compareFunctionElements(
+          resynthesized.entryPoint, original.entryPoint, '(entry point)');
+    }
+    // TODO(paulberry): test exportNamespace, publicNamespace,
     // and metadata.
   }
 
@@ -799,6 +806,15 @@ class E {
     checkLibrary('export "a.dart"; export "b.dart";');
   }
 
+  test_function_entry_point() {
+    checkLibrary('main() {}');
+  }
+
+  test_function_entry_point_in_part() {
+    addNamedSource('/a.dart', 'part of my.lib; main() {}');
+    checkLibrary('library my.lib; part "a.dart";');
+  }
+
   test_function_external() {
     checkLibrary('external f();');
   }