code: public ConstructorDeclaration getConstructor(String signature) {
      for (EntityDeclaration node : type.getMembers()) {
        if (node.getEntityType() == EntityType.CONSTRUCTOR) {
          ConstructorDeclaration cons = (ConstructorDeclaration) node;
          if (signature.equals(signature(cons))) {
            return cons;
          }
        }
      }
      return null;
    }
docs: Returns the Procyon method definition for a specified constructor,
  or null if not found.