Hi everyone,
I am trying to learn about syntax-parse, starting with the introduction
of the "Syntax" documentation.
Unfortunately, the very first example given for the use of syntax-parse
doesn't work in my Racket installation:
Welcome to Racket v5.90.0.9.
racket@> (require syntax/parse)
racket@> (define-syntax (mylet stx)
(syntax-parse stx
[(_ ([var-id rhs-expr] ...) body ...+)
#'((lambda (var-id ...) body ...) rhs-expr ...)]))
stdin::277: _: wildcard not allowed as an expression
in: (_ ((var-id rhs-expr) ...) body ...+)
errortrace...:
context...:
try-next
/Users/hinsen/Development/racket/pkgs/errortrace-pkgs/errortrace-lib/errortrace/errortrace-lib.rkt:480:4
/Users/hinsen/Applications/Racket/collects/racket/private/misc.rkt:87:7
I tried replacing the wildcard by "mylet", but that only leads to another error
message:
racket@> (define-syntax (mylet stx)
(syntax-parse stx
[(mylet ([var-id rhs-expr] ...) body ...+)
#'((lambda (var-id ...) body ...) rhs-expr ...)]))
stdin::842: ...: ellipses not allowed as an expression
in: ...
errortrace...:
context...:
try-next
/Users/hinsen/Development/racket/pkgs/errortrace-pkgs/errortrace-lib/errortrace/errortrace-lib.rkt:480:4
/Users/hinsen/Applications/Racket/collects/racket/private/misc.rkt:87:7
Am I doing something wrong here? Or are the examples obsolete?
Konrad.
____________________
Racket Users list:
http://lists.racket-lang.org/users
