Revert "Fix language tests wrt. warnings."

tests/language/double_to_string_as_fixed2_test.dart

Index: tests/language/double_to_string_as_fixed2_test.dart
diff --git a/tests/language/double_to_string_as_fixed2_test.dart b/tests/language/double_to_string_as_fixed2_test.dart
index d3f97429d84bf6661acd0d1792891863549c8b7c..4da08a4b823d8e408957dfac7d0ca2e9b0910e4f 100644
--- a/tests/language/double_to_string_as_fixed2_test.dart
+++ b/tests/language/double_to_string_as_fixed2_test.dart
@@ -6,17 +6,16 @@
 import "package:expect/expect.dart";
 
 main() {
-  var v = 0.0;
-  Expect.throws(() => v.toStringAsFixed(-1),
+  Expect.throws(() => 0.0.toStringAsFixed(-1),
                 (e) => e is RangeError);
-  Expect.throws(() => v.toStringAsFixed(21),
+  Expect.throws(() => 0.0.toStringAsFixed(21),
                 (e) => e is RangeError);
-  Expect.throws(() => v.toStringAsFixed(null),
+  Expect.throws(() => 0.0.toStringAsFixed(null),
                 (e) => e is ArgumentError);
-  Expect.throws(() => v.toStringAsFixed(1.5),
+  Expect.throws(() => 0.0.toStringAsFixed(1.5),
                 (e) => e is ArgumentError || e is TypeError);
-  Expect.throws(() => v.toStringAsFixed("string"),
+  Expect.throws(() => 0.0.toStringAsFixed("string"),
                 (e) => e is ArgumentError || e is TypeError);
-  Expect.throws(() => v.toStringAsFixed("3"),
+  Expect.throws(() => 0.0.toStringAsFixed("3"),
                 (e) => e is ArgumentError || e is TypeError);
 }