[Swift-user] Error: Attempted to close nonexistent channel buffers

[Veronika Nefedova]

actually, this error shows up when there is a mismatch between input/ 
output lists in declaration and in the function call. I've seen this  
error today - the number of parameters didn't match in declaration  
and actual function call. Once it was fixed, the error went away.

Nika

On Sep 13, 2007, at 3:22 PM, Mihael Hategan wrote:

> What version are you using?
> That error shows a bug in the Swift implementation, and it should have
> been fixed, at least in SVN.
>
> Mihael
>
> On Thu, 2007-09-13 at 14:36 -0400, Allen, M. David wrote:
>> Hello,
>>
>> I'm just getting started with Swift, and trying to program a fairly
>> trivial sample to get started.
>>
>> My swiftscript fails with the message:
>> "Execution failed:
>>         grep started
>> Attempted to close nonexistent channel buffers"
>>
>> Can anyone point me to the documentation that describes such errors?
>> This is referring to a spot in my code that is executing a very
>> vanilla grep operation.  My input file is just 14 lines long, and  
>> this
>> error consistently happens towards the end of the overall workflow
>> execution.
>>
>> The code:
>>
>> type blog {
>>     string name;
>>     string feedURL;
>> }
>>
>> type file { }
>>
>> (file headlines) getHeadlines(blog b) {
>>         app {
>>                 feeder @b.feedURL stdout=@filename(headlines);
>>         }
>> }
>>
>> (file results[]) processBlogs(blog blogs[]) {
>>
>>         foreach blog el, index in blogs {
>>                 results[index] = getHeadlines( el ) ;
>>         }
>> }
>>
>> (string matches) findSingleMatch(file input, string searchTerm) {
>>         app {
>>                 grep "-i" searchTerm @filename(input)  
>> stdout=@matches;
>>         }
>> }
>>
>> (file matches) findMatches(file inputs[], string searchTerm) {
>>         string final;
>>
>>         foreach input, index in inputs {
>>                 string intermed = findSingleMatch(input, searchTerm);
>>                 final = strcat(final, intermed);
>>         }
>>
>>         matches = dumpString(final);
>> }
>>
>> (int retVal) debug(string m) {
>>         app {
>>                 echo m ;
>>         }
>> }
>>
>> (file t) dumpString(string m) {
>>     app {
>>         echo m stdout=@filename(t);
>>     }
>> }
>>
>> blog blogs[]  <csv_mapper; file="blogs.csv", delim=",",
>> header="true">;
>> file output[] <simple_mapper;
>> prefix="output/blogHeadlines",suffix=".txt">;
>> file final <simple_mapper; prefix="output/result", suffix=".txt">;
>>
>> output = processBlogs(blogs);
>> final = findMatches(output, "ARG 0");
>>
>> Any help would be greatly appreciated.
>> --
>> M. David Allen
>> _______________________________________________
>> Swift-user mailing list
>> Swift-user at ci.uchicago.edu
>> http://mail.ci.uchicago.edu/mailman/listinfo/swift-user
>
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