But why does eval's default namespace include "+" but not "expt"?
On Thu, Nov 20, 2014 at 10:39 AM, Éric Tanter <etan...@dcc.uchile.cl> wrote: > This is answered in the Racket Guide, see section 15.1. > > The reason is that you need to provide a namespace (which in the > interaction mode is already initialized). > > So if you do: > > #lang racket/base > (define ns (make-base-namespace)) ; create namespace > (define p1 '(a . (expt 2 3))) > (eval (cdr p1) ns) ; pass it to eval > > it works. > > -- Éric > > > > On Nov 20, 2014, at 12:26 PM, Manfred Lotz <manfred.l...@arcor.de> > wrote: > > > > Hi there, > > If I do this in a REPL > > > > Welcome to Racket v6.1.1. > > -> (define p1 '(a . (expt 2 3))) > > -> (eval (cdr p1)) > > 8 > > > > it works fine > > > > If I put it in a file: > > > > #lang racket/base > > (define p1 '(a . (expt 2 3))) > > (eval (cdr p1)) > > > > I get this: > > > > expt: unbound identifier; > > also, no #%app syntax transformer is bound > > at: expt > > in: (expt 2 3) > > context...: > > /home/manfred/tmp/test.rkt: > > [running body] > > > > > > What am I doing wrong? Sorry, if this is a stupid question. > > > > > > > > -- > > Manfred > > > > > > ____________________ > > Racket Users list: > > http://lists.racket-lang.org/users > > > > > ____________________ > Racket Users list: > http://lists.racket-lang.org/users >
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