Hello Carl,
I found a location in mras.rkt where I comment out the provide for the map-2
function, the program runs, and when I re-instate it, it fails. The section of
code is:
;; map-2
(provide
(proc-doc/names map-2
(procedure? list? list? . -> . list?)
(proc l1 l2)
@{Applies a procedure of two elements to the elements of two
lists,
@racket[l1] and @racket[l2], returning the result in another
list.
When one list is exhausted, the other list is returned as
the rest of the resultant list.}))
Also, when the proc-doc/names section is replaced by the function name, i.e.,
(provide map-2), the program runs.
I was removing provide contracts one by one to see if I could find the problem.
Fortunately, it occurred on the first one I tried, but I don’t know why.
Thanks for your help. I am interested in knowing why this problem occurs, if
you are able to diagnose it further.
Alvin Schatte
From: Carl Eastlund
Sent: Wednesday, September 04, 2013 9:38 PM
To: Alvin Schatte
Cc: Racket Users
Subject: Re: [racket] Question on error message
Alvin,
Thanks for the source. Unfortunately, I can't run what you sent because it's
missing at least one file. Try the following when sharing code for debugging
purposes:
1. Use a site like pastebin.com or gist.github.com where you can easily paste
and share a file without copying an attachment to many people's inboxes over a
mailing list.
2. Include all necessary files, or better yet reduce the example to one file.
3. Similarly, reduce dependencies on third-party libraries such as planet
packages if possible.
Right now I'm missing "diff-e solver.rkt" and I have to install
"wmfarr/simple-matrix:1:1", which is doable but inconvenient. Thanks for the
question and followup, and I'm happy to help if you can post a complete example.
Carl Eastlund
On Wed, Sep 4, 2013 at 10:22 PM, Alvin Schatte <[email protected]> wrote:
Hello Carl,
Thank you for looking at this. I am writing contracts and playing with
documentation for a fairly large module that, right now, performs a system
identification function. The file is attached. I made several changes without
“Run”ning, so I’m not sure what changed caused the error.
Thank you again for your help,
Alvin Schatte
From: Carl Eastlund
Sent: Wednesday, September 04, 2013 9:06 PM
To: Alvin Schatte
Cc: Racket Users
Subject: Re: [racket] Question on error message
Alvin,
That looks like an internal error message from some language feature you're
using, unless you're using something like begin-lifted or
syntax-local-lift-expression directly. Often the contract system generates
names for internal use like "lifted.171", but there shouldn't be duplicate
definitions, and if there are, it's likely not your fault. Can you share the
code that causes this error message? If so, someone may be able to diagnose
the error. Otherwise, with just the error message, we don't have much to go on.
Carl Eastlund
On Wed, Sep 4, 2013 at 9:59 PM, Alvin Schatte <[email protected]> wrote:
Hello,
I got the following error message after <Ctrl-R> in Dr. Racket. I am not
sure what it means:
module: duplicate definition for identifier in: lifted.171
Could someone explain it to me?
Alvin Schatte
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