Improve annotation of type variables in type inference tests.

pkg/front_end/testcases/inference/void_return_type_subtypes_dynamic.dart.strong.expect

Index: pkg/front_end/testcases/inference/void_return_type_subtypes_dynamic.dart.strong.expect
diff --git a/pkg/front_end/testcases/inference/void_return_type_subtypes_dynamic.dart.strong.expect b/pkg/front_end/testcases/inference/void_return_type_subtypes_dynamic.dart.strong.expect
new file mode 100644
index 0000000000000000000000000000000000000000..ca9b8a03f707543eade1408781343d3b84a7edec
--- /dev/null
+++ b/pkg/front_end/testcases/inference/void_return_type_subtypes_dynamic.dart.strong.expect
@@ -0,0 +1,26 @@
+library test;
+import self as self;
+import "dart:core" as core;
+
+static field dynamic x = self::run<dynamic>(self::printRunning);
+static field dynamic y = self::run<void>(self::printRunning);
+static method run<T extends core::Object>(() → self::run::T f) → self::run::T {
+  core::print("running");
+  self::run::T t = f.call();
+  core::print("done running");
+  return t;
+}
+static method printRunning() → void {
+  core::print("running");
+}
+static method main() → dynamic {
+  function printRunning() → void {
+    core::print("running");
+  }
+  dynamic x = self::run<dynamic>(printRunning);
+  void y = self::run<void>(printRunning);
+  x = 123;
+  x = "hi";
+  y = 123;
+  y = "hi";
+}