Ah so that was actually a bug then :) Thanks for fix!

On Thu, Oct 5, 2017 at 5:47 PM, Matthew Flatt <mfl...@cs.utah.edu> wrote:

> I've pushed a repair for this problem. It's a bug in the current
> expander that could be triggered by a just-right combination of
> `syntax-local-lift-expression` (as used by `new`) and `expand` (as used
> by errortrace, which is used by DrRacket).
>
> At Sun, 1 Oct 2017 16:05:16 +0100, Laurent wrote:
> > Hi,
> >
> > Does anyone know a good explanation as to why the following code works
> > depending on whether the apparently-useless line is commented out?
> >
> > #lang racket
> >
> > #;(new object%) ; uncommenting this raises an error
> >
> > (define-namespace-anchor nsa)
> > (define ns (namespace-anchor->namespace nsa))
> > (eval '(new object%) ns)
> >
> > The error is:
> > lifted.0.0: undefined;
> >  cannot reference an identifier before its definition
> > with syntax location on the eval line
> >
> > Thanks!
> >
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