[racket] importing signatures

Did you mean to provide foo:

> #lang racket
>
> (define-signature foo^ (make-foo foo?))
>
> (provide foo^)

Also you can use racket/signature like this:

> #lang racket/signature
>
> make-foo foo?

and then

> #lang racket/unit
>
> (require "sig.rkt")
> (import)
> (export sig^)
>
> (define-struct foo ())




On Jul 26, 2010, at 1:55 PM, Shriram Krishnamurthi wrote:

> Here's the file "sig":
>
>  #lang racket
>  (define-signature Foo (make-foo foo?))
>
> Here's another file:
>
>  #lang racket/unit
>  (require "sig")
>  (import)
>  (export Foo)
>  (define-struct foo ())
>
> When I execute this, I get
>
>  define-unit: unknown signature in: Foo
>
> I would have thought that the the signature is precisely what the
> (require "sig") line would have imported.  I must be missing something
> in the grammar -- anyone?
>
> Shriram
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