When in-body incremantal resolution is performed, it should update REFERENCED_NAMES.

pkg/analyzer/lib/src/generated/incremental_resolver.dart

Index: pkg/analyzer/lib/src/generated/incremental_resolver.dart
diff --git a/pkg/analyzer/lib/src/generated/incremental_resolver.dart b/pkg/analyzer/lib/src/generated/incremental_resolver.dart
index 77907dbd3a88d7c54dc24559ef6f95ba4b70285c..cfa01a9c6c4a43da9a8f390b60eefb0fb3a0f492 100644
--- a/pkg/analyzer/lib/src/generated/incremental_resolver.dart
+++ b/pkg/analyzer/lib/src/generated/incremental_resolver.dart
@@ -870,6 +870,10 @@ class PoorMansIncrementalResolver {
     // parse results
     _sourceEntry.setValueIncremental(PARSE_ERRORS, _newParseErrors, true);
     _sourceEntry.setValueIncremental(PARSED_UNIT, _oldUnit, false);
+    // referenced names
+    ReferencedNames referencedNames = new ReferencedNames(_unitSource);
+    new ReferencedNamesBuilder(referencedNames).build(_oldUnit);
+    _sourceEntry.setValueIncremental(REFERENCED_NAMES, referencedNames, false);
   }
 
   /**