[racket] Is it necessary to add #lang racket in module?

No, 

#lang racket 
(provide run)
(define (run x) x)

is exactly the same as 

(module <synthetic name> racket
 (provide run)
 (define (run x) x))




On Feb 27, 2014, at 4:25 AM, Haulyn Jason wrote:

> Hi,
> 
> I am writing some modules, is it necessary to add #lang racket before my module code?
> 
> my module is like:
> 
> (module my-module racket
>    (provide run)
> 
>    (define (run)
>        (printf "it works")
>    )
> )
> 
> Thanks.
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