Store expression function closures summaries when needed for type inference.

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

 // Copyright (c) 2015, 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.
 
 library analyzer.test.src.summary.summary_common;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/dart/scanner/reader.dart';
@@ skipping 7049 matching lines @@
     if (skipNonConstInitializers) {
       return;
     }
     UnlinkedVariable variable = serializeVariableText('''
 final v = ((a, b) => 42)(1, 2);
 ''');
     _assertUnlinkedConst(variable.initializer.bodyExpr,
         isValidConst: false, operators: [UnlinkedConstOperation.pushNull]);
   }
 
+  test_expr_inClosure() {
+    if (skipNonConstInitializers) {
+      return;
+    }
+    UnlinkedVariable variable = serializeVariableText('var v = () => 1;');
+    _assertUnlinkedConst(variable.initializer.localFunctions[0].bodyExpr,
+        operators: [UnlinkedConstOperation.pushInt], ints: [1]);
+  }
+
+  test_expr_inClosure_noTypeInferenceNeeded() {
+    // We don't serialize closure body expressions for closures that don't need
+    // to participate in type inference.
+    UnlinkedVariable variable = serializeVariableText('Object v = () => 1;');
+    expect(variable.initializer.localFunctions[0].bodyExpr, isNull);
+  }
+
   test_expr_invokeMethod_instance() {
     if (skipNonConstInitializers) {
       return;
     }
     UnlinkedVariable variable = serializeVariableText('''
 class C {
   int m(a, {b, c}) => 42;
 }
 final v = new C().m(1, b: 2, c: 3);
 ''');
@@ skipping 3188 matching lines @@
 class _PrefixExpectation {
   final ReferenceKind kind;
   final String name;
   final String absoluteUri;
   final String relativeUri;
   final int numTypeParameters;
 
   _PrefixExpectation(this.kind, this.name,
       {this.absoluteUri, this.relativeUri, this.numTypeParameters: 0});
 }