Hello everybody, This is my first post to Racket mailing list and hopefully not my last one.
I am working on a project at my university that has to do with genetic programming. I wanted to implement the whole assignment in Racket because of some of its really cool features that I found useful. I create a randomly chosen tree of expressions with "bound" symbol, say x. Something like this: (define tree '(+ x (* 3 (* x x))) Now I want to turn into a procedure by calling (tree->proc tree 'x) I defined this function like this (define (tree->proc tree symbol) (eval `(lambda (,symbol) tree))) and it works in the REPL, but when i call tree->proc from inside the definitions window it produces the error "compile: unbound identifier (and no #%app syntax transformer is bound) in: lambda" I have tried several other Scheme implementations and they do not complain about this. From what I've learned from "JRM's Syntax-rules Primer for the Merely Eccentric" certain environments do not have syntactic mapping for function calls. I guess it is something trivial but cannot figure it out from the documentation. /Milan
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