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no output from ice-9 `format' after `make-thread'

From: Eric Hanchrow
Subject: no output from ice-9 `format' after `make-thread'
Date: 02 Nov 2002 14:59:40 -0800
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2

Guile 1.6.0
Linux offby1 2.4.18 #1 Wed Aug 14 22:07:05 PDT 2002 i686 unknown

configured with `--prefix=/usr/local/guile1.6-threads --with-threads'

buildstamp = Thu Oct 31 06:05:53 PST 2002
LIBS =  -lqthreads -lpthread -lcrypt -lm 
libguileinterface = 15:0:3
guileversion = 1.6.0
pkgincludedir = /usr/local/guile1.6-threads/include/guile
pkglibdir = /usr/local/guile1.6-threads/lib/guile
pkgdatadir = /usr/local/guile1.6-threads/share/guile
includedir = /usr/local/guile1.6-threads/include
mandir = /usr/local/guile1.6-threads/man
infodir = /usr/local/guile1.6-threads/info
libdir = /usr/local/guile1.6-threads/lib
localstatedir = /usr/local/guile1.6-threads/var
sharedstatedir = /usr/local/guile1.6-threads/com
sysconfdir = /usr/local/guile1.6-threads/etc
datadir = /usr/local/guile1.6-threads/share
libexecdir = /usr/local/guile1.6-threads/libexec
sbindir = /usr/local/guile1.6-threads/sbin
bindir = /usr/local/guile1.6-threads/bin
exec_prefix = /usr/local/guile1.6-threads
prefix = /usr/local/guile1.6-threads
top_srcdir = top_srcdir_absolute@
srcdir = /usr/local/src/guile-1.6.0/libguile

unmodified source

no deviations from the standard procedure for installing Guile

here's a snippet that demonstrates the behavior I'm wondering about:

    (use-modules (ice-9 threads))
    (use-modules (ice-9 format))
     (lambda (sym)
        (lambda ()
          (display (format #f "Hey you: ~A~%" sym))
     (list 'bob 'sam))

Invoke the snippet with `guile -s snippet.scm'.  Note the total lack
of output.

Compare this to what happens if you comment out `(use-modules (ice-9
format))', thus presumably bringing in a different `format' procedure:
you see output as I'd expect, namely

    Hey you: bob
    Hey you: sam

Also compare this to what happens if you eliminate the call to
`make-thread', like this:

    (use-modules (ice-9 format))
     (lambda (sym)
       (display (format #f "Hey you: ~A~%" sym)))
     (list 'bob 'sam))

This, too, produces the output shown above.

The bug, or at least my confusion, is that the first version produces
no output.

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