dynamic classes and duck typing

[biozic]

Le 29/11/09 00:36, Walter Bright a écrit :
> And here it is (called opDispatch, Michel Fortin's suggestion):
>
> http://www.dsource.org/projects/dmd/changeset?new=trunk%2Fsrc@268&old=trunk%2Fsrc@267
>

Seems interesting, but for now the error message when no opDispatch 
template can be instantiated looks confusing when trying to use a class 
with an opDispatch implemented, and making e.g. a typo error:

=============================================
module lib;
class Test
{
     string opDispatch(string name)()
     {
         static if (name == "foo")
             return "foo";
     }
}
=============================================
module main;
import lib;
import std.stdio;

void main()
{
     auto test = new Test;
     writeln(test.foo); // OK
     writeln(test.fooo); // Error
}
=============================================

Error is: """
lib.d(5): Error: function lib.Test.opDispatch!("fooo").opDispatch 
expected to return a value of type string
lib.d(9): Error: template instance lib.Test.opDispatch!("fooo") error 
instantiating
"""

nicolas