I don’t think you can. You would need define the struct in an untyped module 
then require it via require/typed. This is why dict’s don’t work in 
typed/racket either.

On Sat, May 24, 2014 at 9:39 PM, Alexander D. Knauth <alexan...@knauth.org>
wrote:

> Do generic interfaces work using structure type properties, and if they do, 
> is there a way to use generic interfaces through properties so that I can do 
> it in typed racket?  
> Specifically I’m trying to use the gen:custom-write and gen:dict generic 
> interfaces.  I can use prop:custom-write for the first one, but I don’t know 
> what to do for gen:dict.  
> Otherwise I’ll just put it in an untyped submodule.  
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