Using `haxe.macro.Compiler.IncludePosition` produce a error

Haxe code:
```haxe
private static function __init__() : Void
{
haxe.macro.Compiler.includeFile("file.js", haxe.macro.Compiler.IncludePosition.Inline);
}
```
Resilt:
```shell
Test.hx:17: characters 55-97 : haxe.macro.Expr should be haxe.macro.IncludePosition
Test.hx:17: characters 55-97 : { pos : haxe.macro.Position, expr : haxe.macro.ExprDef } should be haxe.macro.IncludePosition
Test.hx:17: characters 55-97 : For optional function argument 'position'
```

I think, this behavior is strange. May be we must remove IncludePosition abstract at all?