Use trail in type tests involving the call function (fixes #29405).

tests/language/regress_29405_test.dart

Index: tests/language/regress_29405_test.dart
diff --git a/tests/language/regress_29405_test.dart b/tests/language/regress_29405_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..49077169764d8084149ad96d3cb712992bca4c7e
--- /dev/null
+++ b/tests/language/regress_29405_test.dart
@@ -0,0 +1,12 @@
+// Copyright (c) 2017, 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.
+
+class Foo {
+  void call(void callback(Foo foo)) {}
+}
+
+main() {
+  Foo foo = new Foo();
+  foo(foo);
+}