Record static types in the desugaring of null-aware property gets.

pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// This file declares a "shadow hierarchy" of concrete classes which extend
 /// the kernel class hierarchy, adding methods and fields needed by the
 /// BodyBuilder.
 ///
 /// Instances of these classes may be created using the factory methods in
 /// `ast_factory.dart`.
@@ skipping 1432 matching lines @@
 
   @override
   void _collectDependencies(KernelDependencyCollector collector) {
     // Null aware expressions are not immediately evident.
     collector.recordNotImmediatelyEvident(fileOffset);
   }
 
   @override
   DartType _inferExpression(
       KernelTypeInferrer inferrer, DartType typeContext, bool typeNeeded) {
-    return inferrer.inferPropertyGet(this, variable.initializer, fileOffset,
-        _desugaredGet, typeContext, typeNeeded);
+    var inferredType = inferrer.inferPropertyGet(this, variable.initializer,
+        fileOffset, _desugaredGet, typeContext, true,
+        receiverVariable: variable);
+    body.staticType = inferredType;
+    return inferredType;
   }
 }
 
 /// Concrete shadow object representing a null literal in kernel form.
 class KernelNullLiteral extends NullLiteral implements KernelExpression {
   @override
   void _collectDependencies(KernelDependencyCollector collector) {
     // No inference dependencies.
   }
 
@@ skipping 818 matching lines @@
   }
 
   transformChildren(v) {
     return internalError("Internal error: Unsupported operation.");
   }
 
   visitChildren(v) {
     return internalError("Internal error: Unsupported operation.");
   }
 }