Opt multitests out of formatting in language/.

The new formatter supports opting a region of code out from being
formatted. I'm applying this marker to all of the multitests since
those tests are often very sensitive to formatting and easily broken.
This way, anyone touching a multitest (including me when I reformat
the tests) doesn't have to remember to not run the formatter on it.

Unfortunately, this doesn't opt out 100# of the multitests. There are a
handful of multitests that also contain "@Dart=" comments and are thus
formatted using the old style where the "// dart format off" marker has
no effect. For those, we'll have to still be careful to not accidentally
format them.

Change-Id: I257d0ee1eb44eee57047be06b8520f0ccc7b56d3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/396162
Auto-Submit: Bob Nystrom <[email protected]>
Commit-Queue: Erik Ernst <[email protected]>
Reviewed-by: Erik Ernst <[email protected]>

Author: munificent

tests/language/async/await_syntax_test.dart

@@ -2,6 +2,9 @@
 // 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.
 
+// Formatting can break multitests, so don't format them.
+// dart format off
+
 // Test async/await syntax.
 
 import 'dart:async' show Stream;

tests/language/async/await_test.dart

@@ -2,6 +2,9 @@
 // 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.
 
+// Formatting can break multitests, so don't format them.
+// dart format off
+
 // VMOptions=
 // VMOptions=--optimization-counter-threshold=20
 

tests/language/async/continue_label_test.dart

@@ -2,6 +2,9 @@
 // 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.
 
+// Formatting can break multitests, so don't format them.
+// dart format off
+
 import "package:expect/async_helper.dart";
 import "package:expect/expect.dart";
 

tests/language/async/switch_test.dart

@@ -2,6 +2,9 @@
 // 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.
 
+// Formatting can break multitests, so don't format them.
+// dart format off
+
 import "dart:async";
 import "package:expect/async_helper.dart";
 import "package:expect/expect.dart";

tests/language/async/throw_in_catch_test.dart

@@ -2,6 +2,9 @@
 // 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.
 
+// Formatting can break multitests, so don't format them.
+// dart format off
+
 import "dart:async";
 import "package:expect/async_helper.dart";
 import "package:expect/expect.dart";

tests/language/async_star/async_star_invalid_test.dart

@@ -2,6 +2,9 @@
 // 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.
 
+// Formatting can break multitests, so don't format them.
+// dart format off
+
 // Test that various invalid uses of `yield` are disallowed.
 
 import "dart:async";

tests/language/call/method_function_typed_value_test.dart

@@ -3,6 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 // Dart test program to test arithmetic operations.
 
+// Formatting can break multitests, so don't format them.
+// dart format off
+
 import "package:expect/expect.dart";
 
 int f(int i) => 2 * i;

tests/language/call/method_implicit_tear_off_test.dart

@@ -3,6 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 // Dart test program to test arithmetic operations.
 
+// Formatting can break multitests, so don't format them.
+// dart format off
+
 import "dart:async";
 import "package:expect/expect.dart";
 

tests/language/call/method_must_not_be_field_test.dart

@@ -3,6 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 // Dart test program to test arithmetic operations.
 
+// Formatting can break multitests, so don't format them.
+// dart format off
+
 import "package:expect/expect.dart";
 
 class C {

tests/language/call/method_must_not_be_getter_test.dart

@@ -3,6 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 // Dart test program to test arithmetic operations.
 
+// Formatting can break multitests, so don't format them.
+// dart format off
+
 import "package:expect/expect.dart";
 
 class C {