Re-land "Format all multitests"

tests/language/mixin_of_mixin_test.dart

 // Copyright (c) 2016, 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.
 // SharedOptions=--supermixin
 
 // Validate the following text from section 12 ("Mixins") of the spec:
 //
 //     "A mixin application of the form S with M; defines a class C ...
 //     ... C declares the same instance members as M ..."
 //
 // This means that if M is itself a mixin application, then things
 // mixed into M are accessible through C.  But if M simply *extends* a
 // mixin application (e.g. because M is declared as `class M extends X
 // with Y { ... }`) then things mixed into the mixin application that
 // M extends are not accessible through C.
 
-class A { a() => null; }
-class B { b() => null; }
-class C { c() => null; }
-class D { d() => null; }
+class A {
+  a() => null;
+}
+
+class B {
+  b() => null;
+}
+
+class C {
+  c() => null;
+}
+
+class D {
+  d() => null;
+}
 
 // Note: by a slight abuse of syntax, `class M1 = A with B, C;` effectively
 // means `class M1 = (A with B) with C;`, therefore M1 declares c(), but it
 // merely inherits a() and b().
 class M1 = A with B, C; // declares c()
 
-class M2 extends M1 { m2() => null; }
-class M3 extends A with B, C { m3() => null; }
+class M2 extends M1 {
+  m2() => null;
+}
+
+class M3 extends A with B, C {
+  m3() => null;
+}
+
 class T1 = D with M1; // declares c()
 class T2 = D with M2; // declares m2()
 class T3 = D with M3; // declares m3()
+
 class T4 extends D with M1 {} // extends a class which declares c()
+
 class T5 extends D with M2 {} // extends a class which declares m2()
+
 class T6 extends D with M3 {} // extends a class which declares m3()
 
 main() {
   /// none: static type warning, ok
   new T1().a(); // //# 01: static type warning, runtime error
   new T1().b(); // //# 02: static type warning, runtime error
   new T1().c(); // //# 03: static type warning, ok
   new T2().a(); // //# 04: static type warning, runtime error
   new T2().b(); // //# 05: static type warning, runtime error
   new T2().c(); // //# 06: static type warning, runtime error
   new T2().m2(); //# 07: static type warning, ok
   new T3().a(); // //# 08: static type warning, runtime error
   new T3().b(); // //# 09: static type warning, runtime error
   new T3().c(); // //# 10: static type warning, runtime error
   new T3().m3(); //# 11: static type warning, ok
   new T4().a(); // //# 12: static type warning, runtime error
   new T4().b(); // //# 13: static type warning, runtime error
   new T4().c(); // //# 14: static type warning, ok
   new T5().a(); // //# 15: static type warning, runtime error
   new T5().b(); // //# 16: static type warning, runtime error
   new T5().c(); // //# 17: static type warning, runtime error
   new T5().m2(); //# 18: static type warning, ok
   new T6().a(); // //# 19: static type warning, runtime error
   new T6().b(); // //# 20: static type warning, runtime error
   new T6().c(); // //# 21: static type warning, runtime error
   new T6().m3(); //# 22: static type warning, ok
 }