Pattern matching in Scheme

I’ve got this OCaml codebase I’d like to convert to Scheme, partly to learn the language, partly because I keep getting hit by OCaml’s weird syntax.

Anyway, the aforementioned code makes heavy use of pattern matching. I’ve searched the documentation of DrScheme (now Racket), and found the module that seems to be perfect for me; however, I can’t seem to be able to make even the most basic example work: the code


(require scheme/match)

(define-struct tree (val left right))

(match (make-tree 0 (make-tree 1 #f #f) #f)
      [(tree a (tree b  _ _) _) (list a b)])

gives the error match: syntax error in pattern in: (tree a (tree b _ _) _)

Any of you have experience with pattern matching in Scheme?

>>4
most recent, #lang racket and #lang scheme both work
actually, to reproduce your error I had to comment out the struct definition