Hardcode constructor annotation to 1-arity

[eed3si9n]

Ref #143

steps

// TODO: The last argument should become class_parameters
class A @Inject()(x: Int, y: Int) {
  def x = 1
}

problem

(compilation_unit [0, 0] - [5, 0]
  (comment [0, 0] - [0, 57])
  (class_definition [1, 0] - [3, 1]
    name: (identifier [1, 6] - [1, 7])
    (annotation [1, 8] - [1, 33]
      name: (type_identifier [1, 9] - [1, 15])
      arguments: (arguments [1, 15] - [1, 17])
      arguments: (arguments [1, 17] - [1, 33]
        (ascription_expression [1, 18] - [1, 24]
          (identifier [1, 18] - [1, 19])
          (type_identifier [1, 21] - [1, 24]))
        (ascription_expression [1, 26] - [1, 32]
          (identifier [1, 26] - [1, 27])
          (type_identifier [1, 29] - [1, 32]))))
    body: (template_body [1, 34] - [3, 1]
      (function_definition [2, 2] - [2, 11]
        name: (identifier [2, 6] - [2, 7])
        body: (integer_literal [2, 10] - [2, 11])))))

expectations

@smarter wrote:

I think people usually annotate constructors with java annotations where you always have exactly one parameter list.

So I guess, we can hardcode to 1-arity when we find a constructor annotation for now.

Originally posted by @smarter in #143 (comment)