[racket] How to make an identifier that will have a certain binding no matter what phase level it's referenced at?

 Maybe via " Cross-Phase Persistent Module Declarations"  http://docs.racket-lang.org/reference/syntax-model.html#%28part._cross-phase._persistent-grammar%29 ?


Thu, 24 Jul 2014 21:24:20 -0400 от "Alexander D. Knauth" <alexander at knauth.org>:
>How can I make an identifier that will have a certain binding no matter what phase level it's referenced at?
>
>For example if I’m making a reader extension that will produce a lambda expression, how do I make it so that the lambda expression will be able to exist at any phase level?
>
>For example this program using #lang rackjure doesn’t work:
>#lang rackjure
>(require (for-meta 1 racket/base)
>         (for-meta 2 racket/base)
>         (for-meta 3 racket/base)
>         (for-meta 4 racket/base)
>         )
>                                                                                             
>#λ(* 2 %) ; works, produces approx. (lambda (%) (* 2 %))
>(begin-for-syntax
>  (begin-for-syntax
>    #λ(* 2 %) ; lambda: unbound identifier at phase 2;
>    ;         ;   also, no #%app syntax transformer is bound in: lambda
>    ))
>
>Is there any way to construct an identifier that would be bound to lambda from racket/base no matter what phase level it’s used in?
>
>
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-- 
Roman Klochkov
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