2014-11-20 16:26 GMT+01:00 Manfred Lotz <manfred.l...@arcor.de>: > 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
Since the value of p1 is '(expt 2 3) eval will evaluate '(expt 2 3) in the current namespace. In the repl the current namespace is set to the namespace "inside the module in the definition window" > it works fine > > If I put it in a file: > > #lang racket/base > (define p1 '(a . (expt 2 3))) > (eval (cdr p1)) Here the current namespace haven't been set to the "inside" yet. Therefore the current namespace is empty, it doesn't even have a binding for #%app which stands for standard application. Here is one way to change the current namespace: #lang racket/base (define-namespace-anchor inside) (current-namespace (namespace-anchor->namespace inside)) (define p1 '(a . (expt 2 3))) (eval (cdr p1)) -- Jens Axel Søgaard ____________________ Racket Users list: http://lists.racket-lang.org/users
