Elements. Store name2 in PrefixFragmentImpl.

Change-Id: Idf841cb0c1c7f8bf576c9bd2ced6c69fd1cc495d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/390625
Reviewed-by: Phil Quitslund <[email protected]>
Commit-Queue: Konstantin Shcheglov <[email protected]>

Author: scheglov

pkg/analyzer/lib/src/dart/element/element.dart

@@ -9151,6 +9151,9 @@ class PrefixFragmentImpl implements PrefixFragment {
   @override
   int nameOffset;
 
+  @override
+  FragmentNameImpl name2;
+
   @override
   final bool isDeferred;
 
@@ -9167,6 +9170,7 @@ class PrefixFragmentImpl implements PrefixFragment {
     required this.enclosingFragment,
     required this.name,
     required this.nameOffset,
+    required this.name2,
     required this.isDeferred,
   });
 
@@ -9175,14 +9179,6 @@ class PrefixFragmentImpl implements PrefixFragment {
 
   @override
   CompilationUnitElementImpl get libraryFragment => enclosingFragment;
-
-  @override
-  FragmentName? get name2 {
-    return FragmentNameImpl(
-      name: name,
-      nameOffset: nameOffset,
-    );
-  }
 }
 
 abstract class PromotableElementImpl2 extends VariableElementImpl2

pkg/analyzer/lib/src/summary2/bundle_reader.dart

@@ -1325,6 +1325,7 @@ class LibraryReader {
         enclosingFragment: libraryFragment,
         name: name,
         nameOffset: -1,
+        name2: FragmentNameImpl(name: name, nameOffset: -1),
         isDeferred: isDeferred,
       );
 

pkg/analyzer/lib/src/summary2/informative_data.dart

@@ -665,7 +665,10 @@ class InformativeDataApplier {
           }
         }
 
-        element.prefix2?.nameOffset = info.prefixOffset;
+        if (element.prefix2 case var prefixFragment?) {
+          prefixFragment.nameOffset = info.prefixOffset;
+          prefixFragment.name2.nameOffset = info.prefixOffset;
+        }
         _applyToCombinators(element.combinators, info.combinators);
       },
     );

pkg/analyzer/lib/src/summary2/library_builder.dart

@@ -1203,6 +1203,10 @@ class LibraryBuilder with MacroApplicationsContainer {
     var fragment = PrefixFragmentImpl(
       enclosingFragment: libraryFragment,
       name: name,
+      name2: FragmentNameImpl(
+        name: name,
+        nameOffset: nameOffset,
+      ),
       nameOffset: nameOffset,
       isDeferred: isDeferred,
     );

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

@@ -1579,7 +1579,8 @@ class _Element2Writer extends _AbstractElementWriter {
         _sink.write('fragments: ');
         _sink.write(e.fragments.map((f) {
           expect(f.element, same(e));
-          return '@${f.nameOffset}';
+          expect(f.name2.name, e.name);
+          return '@${f.name2.nameOffset}';
         }).join(' '));
       });
     });