Is this what you are looking for?
(require/typed racket/base
[file-or-directory-modify-seconds
(String (Option Integer) (-> exn:fail:filesystem) -> (U Integer
Void))])
Hari
----- Original Message -----
From: "John Clements" <[email protected]>
To: "plt-dev Developers" <[email protected]>
Sent: Sunday, September 5, 2010 1:44:17 AM GMT -05:00 US/Canada Eastern
Subject: [racket-dev] typed/scheme n00b question
I'd like to write a typed/racket or typed/racket/base program that uses
"file-or-directory-modify-seconds". I get this error:
Type Checker: untyped identifier file-or-directory-modify-seconds imported from
module <typed/racket/base> in: file-or-directory-modify-seconds
If this function were acquired using a 'require', I see that I could use
'require/typed' to associate a type with it. I don't see how to apply this to
functions that come in as part of the language.
I tried various decorations to wrap the use of the function in checks, but then
realized that the type checker wasn't complaining that the value had the 'Any'
type, but instead that the value was untyped, which suggests that type-futzing
(checking that it's a procedure, etc.) was unlikely to help.
What's the (presumably obvious?) solution to this?
John
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