diff --git a/tests/language/prefix/assignment_runtime_test.dart b/tests/language/prefix/assignment_runtime_test.dart
new file mode 100644
index 00000000000..c33c8f5b1e5
--- /dev/null
+++ b/tests/language/prefix/assignment_runtime_test.dart
@@ -0,0 +1,29 @@
+// TODO(multitest): This was automatically migrated from a multitest and may
+// contain strange or dead code.
+
+// 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.
+
+// Validate that assignment to a prefix is handled consistently with the
+// following spec text from section 16.19 (Assignment):
+//     Evaluation of an assignment a of the form v = e proceeds as follows:
+//     Let d be the innermost declaration whose name is v or v=, if it exists.
+//     It is a compile-time error if d denotes a prefix object.
+
+import "empty_library.dart" as p;
+
+class Base {
+  var p;
+}
+
+class Derived extends Base {
+  void f() {
+
+  }
+}
+
+main() {
+  new Derived().f();
+
+}
diff --git a/tests/language/prefix/assignment_test.dart b/tests/language/prefix/assignment_test.dart
new file mode 100644
index 00000000000..5a32011e7d3
--- /dev/null
+++ b/tests/language/prefix/assignment_test.dart
@@ -0,0 +1,32 @@
+// 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.
+
+// Validate that assignment to a prefix is handled consistently with the
+// following spec text from section 16.19 (Assignment):
+//     Evaluation of an assignment a of the form v = e proceeds as follows:
+//     Let d be the innermost declaration whose name is v or v=, if it exists.
+//     It is a compile-time error if d denotes a prefix object.
+
+import "empty_library.dart" as p;
+
+class Base {
+  var p;
+}
+
+class Derived extends Base {
+  void f() {
+    p = 1;
+//  ^
+// [analyzer] COMPILE_TIME_ERROR.PREFIX_IDENTIFIER_NOT_FOLLOWED_BY_DOT
+// [cfe] A prefix can't be used as an expression.
+  }
+}
+
+main() {
+  new Derived().f();
+  p = 1;
+//^
+// [analyzer] COMPILE_TIME_ERROR.PREFIX_IDENTIFIER_NOT_FOLLOWED_BY_DOT
+// [cfe] A prefix can't be used as an expression.
+}
diff --git a/tests/language/prefix/empty_library.dart b/tests/language/prefix/empty_library.dart
new file mode 100644
index 00000000000..fe101dc999a
--- /dev/null
+++ b/tests/language/prefix/empty_library.dart
@@ -0,0 +1,5 @@
+// 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 empty_library;
diff --git a/tests/language/prefix/identifier_reference_test.dart b/tests/language/prefix/identifier_reference_test.dart
new file mode 100644
index 00000000000..e59b6fea630
--- /dev/null
+++ b/tests/language/prefix/identifier_reference_test.dart
@@ -0,0 +1,25 @@
+// 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.
+
+// Validate the following spec text from section 16.32 (Identifier Reference):
+//     Evaluation of an identifier expression e of the form id proceeds as
+//   follows:
+//     Let d be the innermost declaration in the enclosing lexical scope whose
+//   name is id or id=.  If no such declaration exists in the lexical scope,
+//   d be the declaration of the inherited member named id if it exists.
+//     - If d is a prefix p, a compile-time error occurs unless the token
+//       immediately following d is '.'.
+
+import "package:expect/expect.dart";
+import "empty_library.dart" as p;
+
+void f(x) {}
+
+main() {
+  f(p); //        //# 01: compile-time error
+  var x = p; //   //# 02: compile-time error
+  var x = p[0]; //# 03: compile-time error
+  p[0] = null; // //# 04: compile-time error
+  p += 0; //      //# 05: compile-time error
+}
diff --git a/tests/language/prefix/import_collision_runtime_test.dart b/tests/language/prefix/import_collision_runtime_test.dart
new file mode 100644
index 00000000000..e0dc3c08e7e
--- /dev/null
+++ b/tests/language/prefix/import_collision_runtime_test.dart
@@ -0,0 +1,16 @@
+// TODO(multitest): This was automatically migrated from a multitest and may
+// contain strange or dead code.
+
+// Copyright (c) 2011, 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.
+
+// Using the same prefix name while importing two different libraries is
+// not an error but both library1.dart and library2.dart define 'foo' which
+// results in a duplicate definition error.
+import "../library1.dart" as lib2; // defines 'foo'.
+import "../library2.dart" as lib2; // also defines 'foo'.
+
+main() {
+
+}
diff --git a/tests/language/prefix/import_collision_test.dart b/tests/language/prefix/import_collision_test.dart
new file mode 100644
index 00000000000..6ad50cb13ba
--- /dev/null
+++ b/tests/language/prefix/import_collision_test.dart
@@ -0,0 +1,16 @@
+// Copyright (c) 2011, 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.
+
+// Using the same prefix name while importing two different libraries is
+// not an error but both library1.dart and library2.dart define 'foo' which
+// results in a duplicate definition error.
+import "../library1.dart" as lib2; // defines 'foo'.
+import "../library2.dart" as lib2; // also defines 'foo'.
+
+main() {
+  lib2.foo = 1;
+  //   ^^^
+  // [analyzer] STATIC_WARNING.AMBIGUOUS_IMPORT
+  // [cfe] Setter not found: 'foo'.
+}
diff --git a/tests/language/prefix/invalid_name_runtime_test.dart b/tests/language/prefix/invalid_name_runtime_test.dart
new file mode 100644
index 00000000000..a2a71f1c3f6
--- /dev/null
+++ b/tests/language/prefix/invalid_name_runtime_test.dart
@@ -0,0 +1,13 @@
+// TODO(multitest): This was automatically migrated from a multitest and may
+// contain strange or dead code.
+
+// Copyright (c) 2011, 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.
+
+// Prefix must be a valid identifier.
+import "../library1.dart"
+
+    ;
+
+main() {}
diff --git a/tests/language/prefix/invalid_name_test.dart b/tests/language/prefix/invalid_name_test.dart
new file mode 100644
index 00000000000..7ee08b17fe3
--- /dev/null
+++ b/tests/language/prefix/invalid_name_test.dart
@@ -0,0 +1,19 @@
+// Copyright (c) 2011, 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.
+
+// Prefix must be a valid identifier.
+import "../library1.dart"
+    as lib1.invalid
+    // ^^^^
+    // [analyzer] SYNTACTIC_ERROR.EXPECTED_TOKEN
+    // [cfe] Expected ';' after this.
+    //     ^
+    // [analyzer] SYNTACTIC_ERROR.EXPECTED_EXECUTABLE
+    // [cfe] Expected a declaration, but got '.'.
+    //      ^^^^^^^
+    // [analyzer] SYNTACTIC_ERROR.MISSING_CONST_FINAL_VAR_OR_TYPE
+    // [cfe] Variables must be declared using the keywords 'const', 'final', 'var' or a type name.
+    ;
+
+main() {}
diff --git a/tests/language/prefix/new_test.dart b/tests/language/prefix/new_test.dart
new file mode 100644
index 00000000000..23c78345306
--- /dev/null
+++ b/tests/language/prefix/new_test.dart
@@ -0,0 +1,12 @@
+// Copyright (c) 2012, 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 PrefixTest;
+
+import "package:expect/expect.dart";
+import "test1.dart";
+
+main() {
+  Expect.equals(Prefix.getSource(), Prefix.getImport() + 1);
+}
diff --git a/tests/language/prefix/new_test1.dart b/tests/language/prefix/new_test1.dart
new file mode 100644
index 00000000000..106de8037e4
--- /dev/null
+++ b/tests/language/prefix/new_test1.dart
@@ -0,0 +1,19 @@
+// Copyright (c) 2012, 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 PrefixTest1;
+
+import "test2.dart" as test2;
+
+class Prefix {
+  static const int foo = 43;
+
+  static getSource() {
+    return foo;
+  }
+
+  static getImport() {
+    return test2.Prefix.foo;
+  }
+}
diff --git a/tests/language/prefix/new_test2.dart b/tests/language/prefix/new_test2.dart
new file mode 100644
index 00000000000..75a5c6e2241
--- /dev/null
+++ b/tests/language/prefix/new_test2.dart
@@ -0,0 +1,9 @@
+// Copyright (c) 2012, 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 PrefixNewTest2;
+
+class Prefix {
+  static const int foo = 42;
+}
diff --git a/tests/language/prefix/prefix101_test.dart b/tests/language/prefix/prefix101_test.dart
new file mode 100644
index 00000000000..b479e6d7788
--- /dev/null
+++ b/tests/language/prefix/prefix101_test.dart
@@ -0,0 +1,57 @@
+// Copyright (c) 2012, 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.
+
+// Test to check if we are able to import multiple libraries using the
+// same prefix.
+
+library Prefix101Test.dart;
+
+import "package:expect/expect.dart";
+import "../library10.dart" as lib101;
+import "../library11.dart" as lib101;
+
+class Prefix101Test {
+  static Test1() {
+    var result = 0;
+    var obj = new lib101.Library10(1);
+    result = obj.fld;
+    Expect.equals(1, result);
+    result += obj.func();
+    Expect.equals(3, result);
+    result += lib101.Library10.static_func();
+    Expect.equals(6, result);
+    result += lib101.Library10.static_fld;
+    Expect.equals(10, result);
+  }
+
+  static Test2() {
+    var result = 0;
+    var obj = new lib101.Library11(4);
+    result = obj.fld;
+    Expect.equals(4, result);
+    result += obj.func();
+    Expect.equals(7, result);
+    result += lib101.Library11.static_func();
+    Expect.equals(9, result);
+    result += lib101.Library11.static_fld;
+    Expect.equals(10, result);
+  }
+
+  static Test3() {
+    Expect.equals(10, lib101.top_level10);
+    Expect.equals(20, lib101.top_level_func10());
+  }
+
+  static Test4() {
+    Expect.equals(100, lib101.top_level11);
+    Expect.equals(200, lib101.top_level_func11());
+  }
+}
+
+main() {
+  Prefix101Test.Test1();
+  Prefix101Test.Test2();
+  Prefix101Test.Test3();
+  Prefix101Test.Test4();
+}
diff --git a/tests/language/prefix/prefix10_test.dart b/tests/language/prefix/prefix10_test.dart
new file mode 100644
index 00000000000..3e0853cc329
--- /dev/null
+++ b/tests/language/prefix/prefix10_test.dart
@@ -0,0 +1,54 @@
+// Copyright (c) 2011, 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 Prefix10Test.dart;
+
+import "package:expect/expect.dart";
+import "../library10.dart" as lib10;
+import "../library11.dart" as lib11;
+
+class Prefix10Test {
+  static Test1() {
+    var result = 0;
+    var obj = new lib10.Library10(1);
+    result = obj.fld;
+    Expect.equals(1, result);
+    result += obj.func();
+    Expect.equals(3, result);
+    result += lib10.Library10.static_func();
+    Expect.equals(6, result);
+    result += lib10.Library10.static_fld;
+    Expect.equals(10, result);
+  }
+
+  static Test2() {
+    var result = 0;
+    var obj = new lib11.Library11(4);
+    result = obj.fld;
+    Expect.equals(4, result);
+    result += obj.func();
+    Expect.equals(7, result);
+    result += lib11.Library11.static_func();
+    Expect.equals(9, result);
+    result += lib11.Library11.static_fld;
+    Expect.equals(10, result);
+  }
+
+  static Test3() {
+    Expect.equals(10, lib10.top_level10);
+    Expect.equals(20, lib10.top_level_func10());
+  }
+
+  static Test4() {
+    Expect.equals(100, lib11.top_level11);
+    Expect.equals(200, lib11.top_level_func11());
+  }
+}
+
+main() {
+  Prefix10Test.Test1();
+  Prefix10Test.Test2();
+  Prefix10Test.Test3();
+  Prefix10Test.Test4();
+}
diff --git a/tests/language/prefix/prefix11_test.dart b/tests/language/prefix/prefix11_test.dart
new file mode 100644
index 00000000000..ec09c332dde
--- /dev/null
+++ b/tests/language/prefix/prefix11_test.dart
@@ -0,0 +1,55 @@
+// Copyright (c) 2011, 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 Prefix11Test.dart;
+
+import "package:expect/expect.dart";
+import "../library10.dart";
+import "../library11.dart" as lib11;
+
+class Prefix11Test {
+  static Test1() {
+    var result = 0;
+    var obj = new Library10(1);
+    result = obj.fld;
+    Expect.equals(1, result);
+    result += obj.func();
+    Expect.equals(3, result);
+    result += Library10.static_func();
+    Expect.equals(6, result);
+    result += Library10.static_fld;
+    Expect.equals(10, result);
+  }
+
+  static Test2() {
+    var result = 0;
+    var obj = new lib11.Library11(4);
+    result = obj.fld;
+    Expect.equals(4, result);
+    result += obj.func();
+    Expect.equals(7, result);
+    result += lib11.Library11.static_func();
+    Expect.equals(9, result);
+    result += lib11.Library11.static_fld;
+    Expect.equals(10, result);
+  }
+
+  static Test3() {
+    Expect.equals(10, top_level10);
+    Expect.equals(20, top_level_func10());
+  }
+
+  static Test4() {
+    Expect.equals(100, lib11.top_level11);
+    Expect.equals(200, lib11.top_level_func11());
+  }
+}
+
+main() {
+  Prefix11Test.Test1();
+  Prefix11Test.Test2();
+  Prefix11Test.Test3();
+  Prefix11Test.Test4();
+}
diff --git a/tests/language/prefix/prefix12_test.dart b/tests/language/prefix/prefix12_test.dart
new file mode 100644
index 00000000000..5ce98bdb956
--- /dev/null
+++ b/tests/language/prefix/prefix12_test.dart
@@ -0,0 +1,30 @@
+// Copyright (c) 2011, 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 Prefix12Test.dart;
+
+import "package:expect/expect.dart";
+import "../library11.dart" as lib11;
+
+class Prefix12Test {
+  static Test1() {
+    var result = 0;
+    var obj = new lib11.Library11.namedConstructor(10);
+    result = obj.fld;
+    Expect.equals(10, result);
+  }
+
+  static Test2() {
+    int result = 0;
+    var obj = new lib11.Library111<int>.namedConstructor(10);
+    result = obj.fld;
+    Expect.equals(10, result);
+  }
+}
+
+main() {
+  Prefix12Test.Test1();
+  Prefix12Test.Test2();
+}
diff --git a/tests/language/prefix/prefix14_test.dart b/tests/language/prefix/prefix14_test.dart
new file mode 100644
index 00000000000..f9d5c684ad5
--- /dev/null
+++ b/tests/language/prefix/prefix14_test.dart
@@ -0,0 +1,71 @@
+// Copyright (c) 2011, 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.
+//
+// Use qualified symbols at various places.
+
+library Prefix14Test.dart;
+
+import "package:expect/expect.dart";
+import "../library12.dart" as lib12;
+
+typedef lib12.Library12 myFunc(lib12.Library12 param);
+
+class myInterface implements lib12.Library12Interface {
+  myInterface(lib12.Library12 this.myfld);
+  lib12.Library12 addObjects(lib12.Library12 value1, lib12.Library12 value2) {
+    myfld.fld = (value1.fld + value2.fld + myfld.fld);
+    return myfld;
+  }
+
+  lib12.Library12 myfld;
+}
+
+class myClass extends lib12.Library12 {
+  myClass(int value) : super(value);
+  static lib12.Library12 func1() {
+    var i = new lib12.Library12(10);
+    return i;
+  }
+
+  static lib12.Library12 func2(lib12.Library12 param) {
+    return param;
+  }
+}
+
+class myClass1 {
+  myClass1(int value) : fld1 = new lib12.Library12(value);
+  lib12.Library12 fld1;
+}
+
+class myClass2 {
+  myClass2(lib12.Library12 this.fld2);
+  lib12.Library12 fld2;
+}
+
+main() {
+  var o;
+  o = myClass.func1();
+  Expect.equals(2, o.func());
+  o = new myClass(10);
+  Expect.equals(10, o.fld);
+
+  myFunc func = myClass.func2;
+  Expect.equals(2, func(new lib12.Library12(10)).func());
+  Expect.equals(10, func(new lib12.Library12(10)).fld);
+
+  o = new myClass1(100);
+  Expect.equals(2, o.fld1.func());
+  Expect.equals(100, o.fld1.fld);
+
+  o = new myClass2(new lib12.Library12(200));
+  Expect.equals(2, o.fld2.func());
+  Expect.equals(200, o.fld2.fld);
+
+  o = new myInterface(new lib12.Library12(100));
+  Expect.equals(2, o.myfld.func());
+  Expect.equals(100, o.myfld.fld);
+  o = o.addObjects(new lib12.Library12(200), new lib12.Library12(300));
+  Expect.equals(2, o.func());
+  Expect.equals(600, o.fld);
+}
diff --git a/tests/language/prefix/prefix15_test.dart b/tests/language/prefix/prefix15_test.dart
new file mode 100644
index 00000000000..123ae997530
--- /dev/null
+++ b/tests/language/prefix/prefix15_test.dart
@@ -0,0 +1,48 @@
+// Copyright (c) 2011, 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.
+//
+// Use qualified symbols with generics at various places.
+
+library Prefix15Test.dart;
+
+import "package:expect/expect.dart";
+import "../library12.dart" as lib12;
+
+typedef T myFunc<T>(T param);
+
+class myInterface<T extends lib12.Library12>
+    implements lib12.Library12Interface {
+  myInterface(T this.myfld);
+  T addObjects(covariant T value1, covariant T value2) {
+    myfld.fld = (value1.fld + value2.fld + myfld.fld);
+    return myfld;
+  }
+
+  T myfld;
+}
+
+class myClass2<T> {
+  myClass2(T this.fld2);
+  T func(T val) => val;
+  T fld2;
+}
+
+main() {
+  var o;
+  o = new myClass2<lib12.Library12>(new lib12.Library12(100));
+  myFunc<lib12.Library12> func = o.func;
+  Expect.equals(2, func(new lib12.Library12(10)).func());
+  Expect.equals(10, func(new lib12.Library12(10)).fld);
+
+  o = new myClass2<lib12.Library12>(new lib12.Library12(200));
+  Expect.equals(2, o.fld2.func());
+  Expect.equals(200, o.fld2.fld);
+
+  o = new myInterface<lib12.Library12>(new lib12.Library12(100));
+  Expect.equals(2, o.myfld.func());
+  Expect.equals(100, o.myfld.fld);
+  o = o.addObjects(new lib12.Library12(200), new lib12.Library12(300));
+  Expect.equals(2, o.func());
+  Expect.equals(600, o.fld);
+}
diff --git a/tests/language/prefix/prefix16_runtime_test.dart b/tests/language/prefix/prefix16_runtime_test.dart
new file mode 100644
index 00000000000..b309ea2a9ae
--- /dev/null
+++ b/tests/language/prefix/prefix16_runtime_test.dart
@@ -0,0 +1,30 @@
+// TODO(multitest): This was automatically migrated from a multitest and may
+// contain strange or dead code.
+
+// Copyright (c) 2011, 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.
+//
+// Unresolved imported symbols are errors.
+// In this test, the function myFunc contains malformed types because
+// lib12.Library13 is not resolved.
+
+import "package:expect/expect.dart";
+import "../library12.dart" as lib12;
+
+typedef
+
+    myFunc(
+
+        param);
+typedef
+
+    myFunc2(
+
+        param, int i);
+
+main() {
+  Expect.isTrue(((Object? x) => x) is myFunc);
+  Expect.isTrue(((Object? x, int y) => x) is myFunc2);
+  Expect.isFalse(((Object? x, String y) => x) is myFunc2);
+}
diff --git a/tests/language/prefix/prefix16_test.dart b/tests/language/prefix/prefix16_test.dart
new file mode 100644
index 00000000000..874b910bf2f
--- /dev/null
+++ b/tests/language/prefix/prefix16_test.dart
@@ -0,0 +1,39 @@
+// Copyright (c) 2011, 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.
+//
+// Unresolved imported symbols are errors.
+// In this test, the function myFunc contains malformed types because
+// lib12.Library13 is not resolved.
+
+import "package:expect/expect.dart";
+import "../library12.dart" as lib12;
+
+typedef
+    lib12.Library13
+//  ^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.UNDEFINED_CLASS
+// [cfe] Type 'lib12.Library13' not found.
+    myFunc(
+        lib12.Library13
+//      ^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.UNDEFINED_CLASS
+// [cfe] Type 'lib12.Library13' not found.
+        param);
+typedef
+    lib12.Library13
+//  ^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.UNDEFINED_CLASS
+// [cfe] Type 'lib12.Library13' not found.
+    myFunc2(
+        lib12.Library13
+//      ^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.UNDEFINED_CLASS
+// [cfe] Type 'lib12.Library13' not found.
+        param, int i);
+
+main() {
+  Expect.isTrue(((Object x) => x) is myFunc);
+  Expect.isTrue(((Object x, int y) => x) is myFunc2);
+  Expect.isFalse(((Object x, String y) => x) is myFunc2);
+}
diff --git a/tests/language/prefix/prefix17_test.dart b/tests/language/prefix/prefix17_test.dart
new file mode 100644
index 00000000000..9b11ac2aa42
--- /dev/null
+++ b/tests/language/prefix/prefix17_test.dart
@@ -0,0 +1,19 @@
+// Copyright (c) 2011, 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 Prefix17Test.dart;
+
+import "../library12.dart" as lib12;
+
+class LocalClass {
+  static int static_fld = 42;
+}
+
+void main() {
+  var lc1 = new lib12.Library12(5);
+  lib12.Library12 lc2 = new lib12.Library12(10);
+  lib12.Library12 lc2m = new lib12.Library12.other(10, 2);
+  lib12.Library12.static_fld = 43;
+  //print("${LocalClass.static_fld}, ${lc1.fld}, ${lc2.fld}, ${lc2m.fld}, ${lib12.Library12.static_fld}");
+}
diff --git a/tests/language/prefix/prefix21_bad_lib.dart b/tests/language/prefix/prefix21_bad_lib.dart
new file mode 100644
index 00000000000..1869a7f2f1e
--- /dev/null
+++ b/tests/language/prefix/prefix21_bad_lib.dart
@@ -0,0 +1,13 @@
+// Copyright (c) 2011, 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 Prefix21Bad;
+
+int badFunction(int x) {
+  return x << 1;
+}
+
+Function get getValue {
+  return badFunction;
+}
diff --git a/tests/language/prefix/prefix21_good_lib.dart b/tests/language/prefix/prefix21_good_lib.dart
new file mode 100644
index 00000000000..2557726a199
--- /dev/null
+++ b/tests/language/prefix/prefix21_good_lib.dart
@@ -0,0 +1,13 @@
+// Copyright (c) 2011, 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 Prefix21Good;
+
+int goodFunction(int x) {
+  return x;
+}
+
+Function get getValue {
+  return goodFunction;
+}
diff --git a/tests/language/prefix/prefix21_test.dart b/tests/language/prefix/prefix21_test.dart
new file mode 100644
index 00000000000..bcaebd11a9e
--- /dev/null
+++ b/tests/language/prefix/prefix21_test.dart
@@ -0,0 +1,14 @@
+// Copyright (c) 2011, 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 Prefix21;
+
+import "package:expect/expect.dart";
+import "prefix21_good_lib.dart" as good;
+import "prefix21_bad_lib.dart" as bad;
+
+main() {
+  Expect.equals(good.getValue(42), 42);
+  Expect.equals(bad.getValue(42), 84);
+}
diff --git a/tests/language/prefix/prefix22_runtime_test.dart b/tests/language/prefix/prefix22_runtime_test.dart
new file mode 100644
index 00000000000..286256af2cd
--- /dev/null
+++ b/tests/language/prefix/prefix22_runtime_test.dart
@@ -0,0 +1,22 @@
+// TODO(multitest): This was automatically migrated from a multitest and may
+// contain strange or dead code.
+
+// Copyright (c) 2012, 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.
+//
+// Unresolved symbols should be reported as static type warnings.
+// This should not prevent execution.
+
+library Prefix21NegativeTest.dart;
+import "../library12.dart" as lib12;
+
+class myClass {
+  myClass(
+
+      p) { }
+}
+
+main() {
+  new myClass(null);  // no dynamic type error when assigning null
+}
diff --git a/tests/language/prefix/prefix22_test.dart b/tests/language/prefix/prefix22_test.dart
new file mode 100644
index 00000000000..e28423d4c0b
--- /dev/null
+++ b/tests/language/prefix/prefix22_test.dart
@@ -0,0 +1,24 @@
+// Copyright (c) 2012, 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.
+//
+// Unresolved symbols should be reported as static type warnings.
+// This should not prevent execution.
+
+library Prefix21NegativeTest.dart;
+import "../library12.dart" as lib12;
+
+class myClass {
+  myClass(
+      lib12.Library13
+//    ^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.UNDEFINED_CLASS
+// [cfe] Type 'lib12.Library13' not found.
+//          ^
+// [cfe] 'Library13' isn't a type.
+      p) { }
+}
+
+main() {
+  new myClass(null);  // no dynamic type error when assigning null
+}
diff --git a/tests/language/prefix/prefix23_runtime_test.dart b/tests/language/prefix/prefix23_runtime_test.dart
new file mode 100644
index 00000000000..6ab1736b594
--- /dev/null
+++ b/tests/language/prefix/prefix23_runtime_test.dart
@@ -0,0 +1,21 @@
+// TODO(multitest): This was automatically migrated from a multitest and may
+// contain strange or dead code.
+
+// Copyright (c) 2011, 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.
+//
+// Unresolved symbols should be reported as an static type warnings.
+// This should not prevent execution.
+
+library Prefix23Test.dart;
+
+import "../library12.dart" as lib12;
+
+class myClass {
+  final
+
+      fld = null;
+}
+
+main() {}
diff --git a/tests/language/prefix/prefix23_test.dart b/tests/language/prefix/prefix23_test.dart
new file mode 100644
index 00000000000..ef85f1f7bab
--- /dev/null
+++ b/tests/language/prefix/prefix23_test.dart
@@ -0,0 +1,23 @@
+// Copyright (c) 2011, 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.
+//
+// Unresolved symbols should be reported as an static type warnings.
+// This should not prevent execution.
+
+library Prefix23Test.dart;
+
+import "../library12.dart" as lib12;
+
+class myClass {
+  final
+      lib12.Library13
+//    ^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.UNDEFINED_CLASS
+// [cfe] Type 'lib12.Library13' not found.
+//          ^
+// [cfe] 'Library13' isn't a type.
+      fld = null;
+}
+
+main() {}
diff --git a/tests/language/prefix/prefix24_lib1.dart b/tests/language/prefix/prefix24_lib1.dart
new file mode 100644
index 00000000000..557ed8452c8
--- /dev/null
+++ b/tests/language/prefix/prefix24_lib1.dart
@@ -0,0 +1,10 @@
+// Copyright (c) 2013, 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 prefix24_lib1;
+
+import "prefix24_lib2.dart" as X;
+
+// lib1_foo() returns value of bar() in library prefix24_lib2.
+lib1_foo() => X.bar();
diff --git a/tests/language/prefix/prefix24_lib2.dart b/tests/language/prefix/prefix24_lib2.dart
new file mode 100644
index 00000000000..d4dd5926cda
--- /dev/null
+++ b/tests/language/prefix/prefix24_lib2.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2013, 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 prefix24_lib2;
+
+bar() => "prefix24_lib2_bar";
diff --git a/tests/language/prefix/prefix24_lib3.dart b/tests/language/prefix/prefix24_lib3.dart
new file mode 100644
index 00000000000..4490f9b597b
--- /dev/null
+++ b/tests/language/prefix/prefix24_lib3.dart
@@ -0,0 +1,9 @@
+// Copyright (c) 2013, 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 prefix24_lib3;
+
+class X {
+  static bar() => "static method bar of class X";
+}
diff --git a/tests/language/prefix/prefix24_test.dart b/tests/language/prefix/prefix24_test.dart
new file mode 100644
index 00000000000..1e2f4e6cea4
--- /dev/null
+++ b/tests/language/prefix/prefix24_test.dart
@@ -0,0 +1,22 @@
+// Copyright (c) 2013, 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 prefix24_test;
+
+import "package:expect/expect.dart";
+
+// Import a library that contains library prefix X.
+import "prefix24_lib1.dart";
+
+// Import a library that declares class X.
+import "prefix24_lib3.dart";
+
+// Check that the library prefix X that is used in library prefix24_lib1
+// remains private to that library and does not collide with class X
+// defined in (and imported from) prefix24_lib3;
+
+main() {
+  Expect.equals("static method bar of class X", X.bar());
+  Expect.equals("prefix24_lib2_bar", lib1_foo());
+}
diff --git a/tests/language/prefix/prefix_test.dart b/tests/language/prefix/prefix_test.dart
new file mode 100644
index 00000000000..bcecae73b8f
--- /dev/null
+++ b/tests/language/prefix/prefix_test.dart
@@ -0,0 +1,18 @@
+// Copyright (c) 2011, 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 PrefixTest.dart;
+
+import "package:expect/expect.dart";
+import "test1.dart";
+
+class PrefixTest {
+  static testMain() {
+    Expect.equals(Prefix.getSource(), Prefix.getImport() + 1);
+  }
+}
+
+main() {
+  PrefixTest.testMain();
+}
diff --git a/tests/language/prefix/shadow_runtime_test.dart b/tests/language/prefix/shadow_runtime_test.dart
new file mode 100644
index 00000000000..dc83ce3251d
--- /dev/null
+++ b/tests/language/prefix/shadow_runtime_test.dart
@@ -0,0 +1,36 @@
+// TODO(multitest): This was automatically migrated from a multitest and may
+// contain strange or dead code.
+
+// Copyright (c) 2011, 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.
+
+// Type parameters can shadow a library prefix.
+
+import "package:expect/expect.dart";
+import "../library10.dart" as T;
+import "../library10.dart" as lib10;
+
+class P<T> {
+  test() {
+
+  }
+}
+
+main() {
+  new P<int>().test();
+
+  {
+    // Variables in the local scope hide the library prefix.
+
+    var result = 0;
+    result = lib10.Library10.static_fld;
+    Expect.equals(4, result);
+  }
+
+  {
+    // Shadowing is not an error.
+    var lib10 = 1;
+    Expect.equals(2, lib10 + 1);
+  }
+}
diff --git a/tests/language/prefix/shadow_test.dart b/tests/language/prefix/shadow_test.dart
new file mode 100644
index 00000000000..4a5bdc218c5
--- /dev/null
+++ b/tests/language/prefix/shadow_test.dart
@@ -0,0 +1,38 @@
+// Copyright (c) 2011, 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.
+
+// Type parameters can shadow a library prefix.
+
+import "package:expect/expect.dart";
+import "../library10.dart" as T;
+import "../library10.dart" as lib10;
+
+class P<T> {
+  test() {
+    new T.Library10(10);
+    //    ^
+    // [cfe] Method not found: 'T.Library10'.
+  }
+}
+
+main() {
+  new P<int>().test();
+
+  {
+    // Variables in the local scope hide the library prefix.
+    var lib10 = 0;
+    var result = 0;
+    result = lib10.Library10.static_fld;
+    //             ^^^^^^^^^
+    // [analyzer] STATIC_TYPE_WARNING.UNDEFINED_GETTER
+    // [cfe] The getter 'Library10' isn't defined for the class 'int'.
+    Expect.equals(4, result);
+  }
+
+  {
+    // Shadowing is not an error.
+    var lib10 = 1;
+    Expect.equals(2, lib10 + 1);
+  }
+}
diff --git a/tests/language/prefix/test1.dart b/tests/language/prefix/test1.dart
new file mode 100644
index 00000000000..a9c546c6ed6
--- /dev/null
+++ b/tests/language/prefix/test1.dart
@@ -0,0 +1,19 @@
+// Copyright (c) 2011, 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 PrefixTest1.dart;
+
+import "test2.dart" as prefix;
+
+class Prefix {
+  static const int foo = 43;
+
+  static getSource() {
+    return foo;
+  }
+
+  static getImport() {
+    return prefix.Prefix.foo;
+  }
+}
diff --git a/tests/language/prefix/test2.dart b/tests/language/prefix/test2.dart
new file mode 100644
index 00000000000..8538ca38616
--- /dev/null
+++ b/tests/language/prefix/test2.dart
@@ -0,0 +1,9 @@
+// Copyright (c) 2011, 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 PrefixTest2.dart;
+
+class Prefix {
+  static const int foo = 42;
+}
diff --git a/tests/language/prefix/transitive_import_prefix_runtime_test.dart b/tests/language/prefix/transitive_import_prefix_runtime_test.dart
new file mode 100644
index 00000000000..7b016cc6381
--- /dev/null
+++ b/tests/language/prefix/transitive_import_prefix_runtime_test.dart
@@ -0,0 +1,14 @@
+// TODO(multitest): This was automatically migrated from a multitest and may
+// contain strange or dead code.
+
+// Copyright (c) 2011, 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.
+import "../library10.dart";
+
+main() {
+  // Library prefixes in the imported libraries should not be visible here.
+
+
+
+}
diff --git a/tests/language/prefix/transitive_import_prefix_test.dart b/tests/language/prefix/transitive_import_prefix_test.dart
new file mode 100644
index 00000000000..9186560f254
--- /dev/null
+++ b/tests/language/prefix/transitive_import_prefix_test.dart
@@ -0,0 +1,20 @@
+// Copyright (c) 2011, 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.
+import "../library10.dart";
+
+main() {
+  // Library prefixes in the imported libraries should not be visible here.
+  new lib11.Library11(1);
+  //  ^^^^^^^^^^^^^^^
+  // [analyzer] STATIC_WARNING.NEW_WITH_NON_TYPE
+  // [cfe] Method not found: 'lib11.Library11'.
+  lib11.Library11.static_func();
+//^^^^^
+// [analyzer] STATIC_WARNING.UNDEFINED_IDENTIFIER
+// [cfe] Getter not found: 'lib11'.
+  lib11.Library11.static_fld;
+//^^^^^
+// [analyzer] STATIC_WARNING.UNDEFINED_IDENTIFIER
+// [cfe] Getter not found: 'lib11'.
+}
diff --git a/tests/language/prefix/transitive_import_runtime_test.dart b/tests/language/prefix/transitive_import_runtime_test.dart
new file mode 100644
index 00000000000..6c130f676fe
--- /dev/null
+++ b/tests/language/prefix/transitive_import_runtime_test.dart
@@ -0,0 +1,18 @@
+// TODO(multitest): This was automatically migrated from a multitest and may
+// contain strange or dead code.
+
+// Copyright (c) 2011, 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.
+
+// Symbols in libraries imported by the prefixed library should not be visible.
+
+import "../library12.dart" as lib12;
+
+main() {
+  // Class should not be visible.
+
+
+  // Variable should not be visible.
+
+}
diff --git a/tests/language/prefix/transitive_import_test.dart b/tests/language/prefix/transitive_import_test.dart
new file mode 100644
index 00000000000..0ae3fa75086
--- /dev/null
+++ b/tests/language/prefix/transitive_import_test.dart
@@ -0,0 +1,21 @@
+// Copyright (c) 2011, 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.
+
+// Symbols in libraries imported by the prefixed library should not be visible.
+
+import "../library12.dart" as lib12;
+
+main() {
+  // Class should not be visible.
+  new lib12.Library11(1);
+  //        ^^^^^^^^^
+  // [analyzer] STATIC_WARNING.NEW_WITH_NON_TYPE
+  // [cfe] Method not found: 'Library11'.
+
+  // Variable should not be visible.
+  lib12.top_level11;
+  //    ^^^^^^^^^^^
+  // [analyzer] STATIC_TYPE_WARNING.UNDEFINED_PREFIXED_NAME
+  // [cfe] Getter not found: 'top_level11'.
+}
diff --git a/tests/language/prefix/unqualified_invocation_runtime_test.dart b/tests/language/prefix/unqualified_invocation_runtime_test.dart
new file mode 100644
index 00000000000..0841ed0ee10
--- /dev/null
+++ b/tests/language/prefix/unqualified_invocation_runtime_test.dart
@@ -0,0 +1,32 @@
+// TODO(multitest): This was automatically migrated from a multitest and may
+// contain strange or dead code.
+
+// 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.
+
+// Validate the following spec text from section 16.14.3 (Unqualified
+// invocation):
+//     An unqualifiedfunction invocation i has the form
+//     id(a1, ..., an, xn+1 : an+1, ..., xn+k : an+k),
+//     where id is an identifier.
+//     If there exists a lexically visible declaration named id, let fid be the
+//   innermost such declaration.  Then:
+//     - If fid is a prefix object, a compile-time error occurs.
+
+import "empty_library.dart" as p;
+
+class Base {
+  void p() {}
+}
+
+class Derived extends Base {
+  void f() {
+
+  }
+}
+
+main() {
+  new Derived().f();
+
+}
diff --git a/tests/language/prefix/unqualified_invocation_test.dart b/tests/language/prefix/unqualified_invocation_test.dart
new file mode 100644
index 00000000000..decb2098d0a
--- /dev/null
+++ b/tests/language/prefix/unqualified_invocation_test.dart
@@ -0,0 +1,35 @@
+// 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.
+
+// Validate the following spec text from section 16.14.3 (Unqualified
+// invocation):
+//     An unqualifiedfunction invocation i has the form
+//     id(a1, ..., an, xn+1 : an+1, ..., xn+k : an+k),
+//     where id is an identifier.
+//     If there exists a lexically visible declaration named id, let fid be the
+//   innermost such declaration.  Then:
+//     - If fid is a prefix object, a compile-time error occurs.
+
+import "empty_library.dart" as p;
+
+class Base {
+  void p() {}
+}
+
+class Derived extends Base {
+  void f() {
+    p();
+//  ^
+// [analyzer] COMPILE_TIME_ERROR.PREFIX_IDENTIFIER_NOT_FOLLOWED_BY_DOT
+// [cfe] A prefix can't be used as an expression.
+  }
+}
+
+main() {
+  new Derived().f();
+  p();
+//^
+// [analyzer] COMPILE_TIME_ERROR.PREFIX_IDENTIFIER_NOT_FOLLOWED_BY_DOT
+// [cfe] A prefix can't be used as an expression.
+}
diff --git a/tests/language/prefix/unresolved_class_runtime_test.dart b/tests/language/prefix/unresolved_class_runtime_test.dart
new file mode 100644
index 00000000000..17442cc4ca9
--- /dev/null
+++ b/tests/language/prefix/unresolved_class_runtime_test.dart
@@ -0,0 +1,22 @@
+// TODO(multitest): This was automatically migrated from a multitest and may
+// contain strange or dead code.
+
+// Copyright (c) 2011, 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.
+
+// Unresolved symbols should be reported as an error.
+import "../library12.dart" as lib12;
+
+class Subclass
+
+{}
+
+class Implementer
+
+{}
+
+main() {
+  new Subclass();
+  new Implementer();
+}
diff --git a/tests/language/prefix/unresolved_class_test.dart b/tests/language/prefix/unresolved_class_test.dart
new file mode 100644
index 00000000000..dd46a620ffe
--- /dev/null
+++ b/tests/language/prefix/unresolved_class_test.dart
@@ -0,0 +1,25 @@
+// Copyright (c) 2011, 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.
+
+// Unresolved symbols should be reported as an error.
+import "../library12.dart" as lib12;
+
+class Subclass
+    extends lib12.Library13
+    //      ^^^^^^^^^^^^^^^
+    // [analyzer] COMPILE_TIME_ERROR.EXTENDS_NON_CLASS
+    // [cfe] Type 'lib12.Library13' not found.
+{}
+
+class Implementer
+    implements lib12.Library13
+    //         ^^^^^^^^^^^^^^^
+    // [analyzer] COMPILE_TIME_ERROR.IMPLEMENTS_NON_CLASS
+    // [cfe] Type 'lib12.Library13' not found.
+{}
+
+main() {
+  new Subclass();
+  new Implementer();
+}
diff --git a/tests/language/prefix/variable_collision_runtime_test.dart b/tests/language/prefix/variable_collision_runtime_test.dart
new file mode 100644
index 00000000000..87082c0cdc8
--- /dev/null
+++ b/tests/language/prefix/variable_collision_runtime_test.dart
@@ -0,0 +1,12 @@
+// TODO(multitest): This was automatically migrated from a multitest and may
+// contain strange or dead code.
+
+// Copyright (c) 2011, 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.
+import "../library10.dart" as lib10;
+
+// Top level variables cannot shadow library prefixes, they should collide.
+
+
+main() {}
diff --git a/tests/language/prefix/variable_collision_test.dart b/tests/language/prefix/variable_collision_test.dart
new file mode 100644
index 00000000000..fa19d625498
--- /dev/null
+++ b/tests/language/prefix/variable_collision_test.dart
@@ -0,0 +1,13 @@
+// Copyright (c) 2011, 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.
+import "../library10.dart" as lib10;
+//                            ^
+// [cfe] 'lib10' is already declared in this scope.
+
+// Top level variables cannot shadow library prefixes, they should collide.
+var lib10;
+//  ^^^^^
+// [analyzer] COMPILE_TIME_ERROR.PREFIX_COLLIDES_WITH_TOP_LEVEL_MEMBER
+
+main() {}