[Bug-kawa] [bug #49943] kawa (command-line program) hangs when importing library twice

[Sudarshan S Chawathe]

URL:
  <http://savannah.gnu.org/bugs/?49943>

                 Summary: kawa (command-line program) hangs when importing
library twice
                 Project: Kawa
            Submitted by: chaw
            Submitted on: Wed 28 Dec 2016 12:44:40 AM GMT
                Category: Scheme language
                Severity: 3 - Normal
              Item Group: Unexpected result
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

When I import a library multiple times, the kawa command-line program (simple
REPL-in-a-terminal) hangs:

address@hidden:~/res/scheme/local-libs$ kawa
#|kawa:1|# (include "128.sld")
/home/chaw/res/scheme/local-libs/128.body1.scm:241:9: warning - no use of
norp?
#|kawa:2|# (import (srfi 128))
#|kawa:3|# (import (srfi 128))

[... hangs here ...]

The "128.sld" file is from the sample implementation of SRFI 128.

I came across this problem when running a Kawa REPL within emacs and then
distilled it down to the above in the plain kawa program (run from a terminal
window).  Of course, I don't really need to import (srfi 128) twice, but it
was the simplest way I found of getting the hanging behavior.  In my actual
code, SRFI 128 is imported indirectly by a library I'm importing and then
again directly (and that causes the Kawa REPL to hang).

I am not sure how reproducible this is for other setups, but figure it may be
worthwhile reporting it nonetheless.  I am using Kawa 2.2 (revision 9049M) on
a 32-bit Debian setup with OpenJDK 8 and I have been able to always reproduce
it in my tests so far.  In a few cases, kawa did not hang on the second
import, but did on the third or fourth.




 





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