serious using + abstract cast problem (@:to cast is not generated)

[frabbit]

In the following example the conversion from MyInt to String for the variable z is not generated (tested in javascript) and leads to a runtime error:

using Test.Strings;

abstract MyInt(Int) {
    public inline function new (x:Int) this = x;
    @:to inline function toString ():String return "asString: " + this;
}

class Strings {
    public static function passString (s:String) trace(s.indexOf("whatever")); 
}

class Test 
{
    static function main () 
    {
        var z = new MyInt(1);

        // no cast generated, leads to runtime error
        z.passString();

        // fine, cast is generated
        Strings.passString(z);
       }
}

[frabbit]

btw. removing inline doesn't change anything.

[frabbit]

thx a lot!