Hi Chad, Yes, it is redundant. See : http://docs.racket-lang.org/guide/modules.html
Laurent On Wed, May 9, 2012 at 11:28 PM, Danny Yoo <[email protected]> wrote: > [forwarding to racket-users] > > > ---------- Forwarded message ---------- > From: Chad Albers <[email protected]> > Date: Wed, May 9, 2012 at 2:22 PM > Subject: Re: [racket] Rationale behind missing string-trim > To: Danny Yoo <[email protected]> > > > Happy to help you guys identify a bug. On a side note, that's not > really relevant to this thread, I was wondering about your statement > about #lang racket. > > I had assume that you just add #lang racket, if you're writing a > racket script, sort of like the hash bang syntax of a shell script. > Is that a correct assumption? Related, the code I'm writing is > actually in a module I'm creating, and I've used this to source the > racket language: > > (module rig racket > > (require racket/base > (for-syntax racket/base > racket/syntax)) > > Should I have used #lang racket? is racket/base redundant, since I > have it in the module definition? Thanks for your help, if you can > answer these questions for me. > > Chad > > -- > Chad Albers > > > > > On Wed, May 9, 2012 at 1:45 PM, Danny Yoo <[email protected]> wrote: > > > > On Wed, May 9, 2012 at 1:23 PM, Chad Albers <[email protected]> > wrote: > > > If my require reads as follows > > > > > > (require racket/base > > > srfi/13 > > > (for-syntax racket/base > > > racket/syntax)) > > > > > > I get the following error message: > > > > > > module: identifier already imported from: racket at: string-upcase in: > > > srfi/13 > > > > > > > > > Huh! That looks like the error reporting is misattributing the source > > of the conflict. I'll send a bug report. > > > > The error is highlighting the "racket" in the #lang line and srfi/13, > > but the true source of the conflict's really between the exports of > > racket/base and srfi/13. For demonstration, try: > > > > ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; > > #lang racket > > (require (only-in racket/base string-upcase) > > srfi/13) > > ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; > > > > vs: > > > > ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; > > #lang racket > > (require (only-in racket/base) > > srfi/13) > > ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; > > > > In the first, we tell Racket o use both the string-upcase function in > > racket/base, as well as all the exports of srfi/13. Since both > > requires provide a string-upcase function, there's a conflict, which > > the DrRacket environment reports. > > > > In the second, we mask out all the exports from racket/base. So the > > exports of srfi/13 can otherwise shadow everything else without > > complaint. > > > > > > > > Side note: the big language of "#lang racket" provides everything in > > racket/base, so the (require racket/base) is actually redundant. You > > can write: > > > > #lang racket > > (require srfi/13) > > ____________________ > Racket Users list: > http://lists.racket-lang.org/users >
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