Reference local class as `Self`.

Self.hx

package ;

#if macro
import haxe.macro.Context.*;
class Self {
  static public function buildSelf()
    return getType(
      switch getTypedExpr(typeExpr(macro (function (?pos:haxe.PosInfos) {})())).expr {
        case ECall(_, [macro { fileName: $_, lineNumber: $_, className: ${{ expr: EConst(CString(name)) }}, methodName: $_ }]): name;
        default: throw 'assert';
      }
    );  
}
#else
@:genericBuild(Self.buildSelf())
class Self {}
#end

Usage example: http://try-haxe.mrcdk.com/#72855

Please note that this does not work across inheritance.

Meaning:

class A {
  public function new() {}
  public function foo():Self return this;
}
class B extends A {}
$type(new B().foo());//yields A

All this type does is to refer to the class itself in the context of the class. The use case for this is to have the class name appear exactly once per class declaration.