> > But what surprises me the most is that it only works at the top level: > assign.rkt> > assign.rkt> (assign foo 3) > assign.rkt> (assign (bar x) (assign foo 7) (* x foo)) > assign.rkt> (bar 1) > 7 > assign.rkt> global > '#hash((bar . (λ (x) (assign foo 7) (* x foo))) (foo . 3)) > Interesting. Following your steps, I got a different result that makes more sense:
'#hash((bar . (λ (x) (assign foo 7) (* x foo))) (foo . 7)) Another question: my macro doesn't work with (f . xs) notation. Of course, > I could add a [_ f . xs] syntax-case. But I would also have to add a [_ f a > ... . xs]. Plus keywords. Is there a way not to have to describe every > possible situation? > For a “flat” function definition, (_ f a ... . xs) is the most general form. It encompasses patterns like (_ f . xs), where a matches 0 times, and (_ f 1 2), where xs is (). So if you have that, you don’t need any other cases. FYI: function definition allows the curry form too. E.g., (define ((f x) y) (+ x y)) The most convenient way to parse the header is to switch from syntax-case to syntax-parse, and use the function-header syntax class in syntax/parse/lib/function-header. Lambda doesn’t support currying notation though, so maybe you don’t care about it. -- > You received this message because you are subscribed to the Google Groups > "Racket Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/racket-users/CAN4YmREN1q%2BDTF1UbTHc8LmN3gfnea5HAZCQfc%3DRPyLVHX2yVg%40mail.gmail.com > <https://groups.google.com/d/msgid/racket-users/CAN4YmREN1q%2BDTF1UbTHc8LmN3gfnea5HAZCQfc%3DRPyLVHX2yVg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/CADcueguaarpbWdz3PEPjySY85ab9UNc%3Dx3h%2B4h3V6JLXEBOSMg%40mail.gmail.com.
