Properly resolve dependency part paths in summary linker.

pkg/analyzer/test/src/summary/resynthesize_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 test.src.serialization.elements_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/constant/value.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 3599 matching lines @@
 f({void g(int x, void h())}) => null;
 var v = f(g: (x, y) {});
 ''');
   }
 
   test_inferred_type_refers_to_setter_function_typed_parameter_type() {
     checkLibrary('class C extends D { void set f(g) {} }'
         ' abstract class D { void set f(int g(String s)); }');
   }
 
+  void test_inferredType_definedInSdkLibraryPart() {
+    addSource(
+        '/a.dart',
+        r'''
+import 'dart:async';
+class A {
+  m(Stream p) {}
+}
+''');
+    LibraryElement library = checkLibrary(r'''
+import 'a.dart';
+class B extends A {
+  m(p) {}
+}
+  ''');
+    ClassElement b = library.definingCompilationUnit.types[0];
+    ParameterElement p = b.methods[0].parameters[0];
+    // This test should verify that we correctly record inferred types,
+    // when the type is defined in a part of an SDK library. So, test that
+    // the type is actually in a part.
+    Element streamElement = p.type.element;
+    if (streamElement is ClassElement) {
+      expect(streamElement.source, isNot(streamElement.library.source));
+    }
+  }
+
   void test_inferredType_usesSyntheticFunctionType_functionTypedParam() {
     checkLibrary('''
 int f(int x(String y)) => null;
 String g(int x(String y)) => null;
 var v = [f, g];
 ''');
   }
 
   test_inheritance_errors() {
     checkLibrary('''
@@ skipping 1147 matching lines @@
       fail('Unexpectedly tried to get unlinked summary for $uri');
     }
     return serializedUnit;
   }
 
   @override
   bool hasLibrarySummary(String uri) {
     return true;
   }
 }