Format all tests.

tests/language/propagate_past_constant_test.dart

Index: tests/language/propagate_past_constant_test.dart
diff --git a/tests/language/propagate_past_constant_test.dart b/tests/language/propagate_past_constant_test.dart
index 03858b4b56aa238de47ad6417cc6e58a54e1cac3..095e70602914648e9456d624df22466f032fd513 100644
--- a/tests/language/propagate_past_constant_test.dart
+++ b/tests/language/propagate_past_constant_test.dart
@@ -14,7 +14,8 @@ main() {
   var x = foo('foo');
   var y = foo(x);
   x = 'constant';
-  check(y); // 'y' should not propagate here unless reference to 'x' is rewritten
+  check(
+      y); // 'y' should not propagate here unless reference to 'x' is rewritten
   foo(x);
   foo(x);
 }