Remove the final error being generated in a scope

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

Index: pkg/analyzer/lib/src/generated/element_resolver.dart
diff --git a/pkg/analyzer/lib/src/generated/element_resolver.dart b/pkg/analyzer/lib/src/generated/element_resolver.dart
index 97150fcfe0fbfb4bf0e1523b74a75d65bd81dd05..e70c1d8e639a6922a1efee1bf95e9b8bbdc1a0b2 100644
--- a/pkg/analyzer/lib/src/generated/element_resolver.dart
+++ b/pkg/analyzer/lib/src/generated/element_resolver.dart
@@ -2453,9 +2453,11 @@ class ElementResolver extends SimpleAstVisitor<Object> {
     } else if (element == null &&
         (identifier.inSetterContext() ||
             identifier.parent is CommentReference)) {
-      element = _resolver.nameScope.lookup(
-          new SyntheticIdentifier("${identifier.name}=", identifier),
-          _definingLibrary);
+      Identifier setterId =
+          new SyntheticIdentifier('${identifier.name}=', identifier);
+      element = _resolver.nameScope.lookup(setterId, _definingLibrary);
+      identifier.setProperty(LibraryImportScope.conflictingSdkElements,
+          setterId.getProperty(LibraryImportScope.conflictingSdkElements));
     }
     ClassElement enclosingClass = _resolver.enclosingClass;
     if (element == null && enclosingClass != null) {