[racket] source locations of syntax objects in a required file

For an example match does this:
https://github.com/plt/racket/blob/master/racket/collects/racket/match/gen-match.rkt#L36

Added in this commit
https://github.com/plt/racket/commit/fc8ed9772a701062dff2b928fb99d90e01b7f177


On Sun, Mar 8, 2015 at 2:01 PM, Robby Findler <robby at eecs.northwestern.edu>
wrote:

> Syntax object constants, when compiled, have their source location
> information discarded. So you're running in drracket, I guess, with
> automatic compilation on. The usual way around this is to write a
> macro that explicitly tracks the source locations that you care about
> and use it (instead of using quote-syntax).
>
> Robby
>
>
> On Sun, Mar 8, 2015 at 1:19 PM, Alexander D. Knauth
> <alexander at knauth.org> wrote:
> > If I have these files:
> > test.rkt:
> > #lang racket
> > (define stx #'here)
> > (syntax-source stx)
> > (syntax-line stx)
> > (syntax-column stx)
> > (syntax-position stx)
> > (syntax-span stx)
> > require-test.rkt:
> > #lang racket
> > (require "test.rkt")
> >
> > Then when I run test.rkt, it prints:
> > #<path:/Users/Alex/Documents/DrRacket/srcloc/test.rkt>
> > 2
> > 14
> > 28
> > 4
> > As expected.  But when I run require-test.rkt, it prints:
> > #f
> > #f
> > #f
> > #f
> > 0
> >
> > What happened to the source locations?  Why is it doing this?
> >
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