Check that it is possible to both declare and call class constructors
without using parenthesis after the `new` keyword.
Check that a non-ANSI port for a class constructor results in an error.
Check that it is possible to invoke a class task through a implicit class
handle (`this` or `super`) without using parenthesis after the task name.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>