Account Options

  1. Sign in
The old Google Groups will be going away soon, but your browser is incompatible with the new version.
Google Groups Home
« Groups Home
Racket Users
Home
About this group
Join this group
Message from discussion Case with strings: normal behavior?
The group you are posting to is a Usenet group. Messages posted to this group will make your email address visible to anyone on the Internet.
Your reply message has not been sent.
Your post was successful
 
From:
To:
Cc:
Followup To:
Add Cc | Add Followup-to | Edit Subject
Subject:
Validation:
For verification purposes please type the characters you see in the picture below or the numbers you hear by clicking the accessibility icon. Listen and type the numbers you hear
 
Matthew Flatt  
View profile  
 More options Nov 19 2012, 8:18 am
From: Matthew Flatt <mfl...@cs.utah.edu>
Date: Mon, 19 Nov 2012 06:13:09 -0700
Local: Mon, Nov 19 2012 8:13 am
Subject: Re: [racket] Case with strings: normal behavior?
Print | View thread | Show original | Report this message | Find messages by this author
This is not-quite-intuitive behavior. The `case' form is based on
`eqv?' instead of `equal?', and the first example works because string
literals are interned, while the result of `string-append' is not.

Should we change `case' to use `equal?' instead of `eqv?'? I can't
think of a good reason to stick with `eqv?'.

At Mon, 19 Nov 2012 14:07:16 +0100, Laurent wrote:

> Hi,

> Is this a bug or a not quite intuitive normal behavior?
> > (define (foo s)
>     (case s
>       [("a") 'a]
>       [else 'none]))
> > (foo "a")
> 'a
> > (foo (string-append "a" ""))
> 'none

> in 5.3.1.5--2012-11-08(5589bcb/a) [3m].

> Laurent
> ____________________
>   Racket Users list:
>   http://lists.racket-lang.org/users

____________________
  Racket Users list:
  http://lists.racket-lang.org/users

 
You must Sign in before you can post messages.
To post a message you must first join this group.
Please update your nickname on the subscription settings page before posting.
You do not have the permission required to post.
Create a group - Google Groups - Google Home - Terms of Service - Privacy Policy
©2013 Google