CODEWITHSUNDEEP
schemeracket
rnso
rnso

Reputation: 24545

eval works on command line but not in script file

Following simple 'eval' statement works well on command line of DrRacket (as mentioned on https://docs.racket-lang.org/guide/eval.html ): 

> (eval '(+ 1 2))
3

However, if kept in the script file (main area of DrRacket) and run, it produces error: 

#lang racket

(eval '(+ 1 2))

Error:

+: unbound identifier;
 also, no #%app syntax transformer is bound in: +
>

Where is the problem?

Upvotes: 0

Views: 174

Answers (1)

Óscar López
Óscar López

Reputation: 236004

In Racket, this is the correct way to run eval inside a script:

(define-namespace-anchor a)
(define ns (namespace-anchor->namespace a))


(eval '(+ 1 2) ns)
=> 3

Please refer to the documentation.

Upvotes: 1

Related Questions