[plt-scheme] Contract Error Message

From: Carl Eastlund (carl.eastlund at gmail.com)
Date: Mon Jul 20 14:47:23 EDT 2009

On Mon, Jul 20, 2009 at 2:40 PM, David Van Horn<dvanhorn at ccs.neu.edu> wrote:
> Carl Eastlund wrote:
>> What you wrote was a perfectly acceptable contract that functioned
>> perfectly, except that it wasn't the one you meant it to be.  What
>> alternate behavior would you propose?
> Actually, Paulo broke the contract on or/c, so this could have a better
> error message without changes to the contract language.
> David

Not according to the documentation I find here:


Constants are perfectly acceptable contracts.  If the contract?
function doesn't accept them, then either contract? needs to start
accepting them or or/c needs to be documented with a more general
contract.  But values like #f, 'foo, or 5 are usable with most
contract primitives.


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