Fail inference when an instance field is referenced.

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

Index: pkg/analyzer/lib/src/summary/summarize_const_expr.dart
diff --git a/pkg/analyzer/lib/src/summary/summarize_const_expr.dart b/pkg/analyzer/lib/src/summary/summarize_const_expr.dart
index dcde920733b39fa7586c3118341441b29325bca8..def774ad9858df6a56aa379d34b20335f9587f7d 100644
--- a/pkg/analyzer/lib/src/summary/summarize_const_expr.dart
+++ b/pkg/analyzer/lib/src/summary/summarize_const_expr.dart
@@ -369,7 +369,8 @@ abstract class AbstractConstExprSerializer {
     } else if (expr is AssignmentExpression) {
       _serializeAssignment(expr);
     } else if (expr is CascadeExpression) {
-      _serializeCascadeExpression(expr);
+      isValidConst = false;
+      _serialize(expr.target);
     } else if (expr is FunctionExpression) {
       isValidConst = false;
       List<int> indices = serializeFunctionExpression(expr);
@@ -519,15 +520,6 @@ abstract class AbstractConstExprSerializer {
     }
   }
 
-  void _serializeCascadeExpression(CascadeExpression expr) {
-    _serialize(expr.target);
-    for (Expression section in expr.cascadeSections) {
-      operations.add(UnlinkedExprOperation.cascadeSectionBegin);
-      _serialize(section);
-      operations.add(UnlinkedExprOperation.cascadeSectionEnd);
-    }
-  }
-
   void _serializeListLiteral(ListLiteral expr) {
     List<Expression> elements = expr.elements;
     elements.forEach(_serialize);