In guile 1.6.1 or the cvs on a recent i386 debian, I noticed that
doing a display of a weak key hash table can seemingly prevent a key
from being garbage collected. For instance
(define h (make-weak-key-hash-table 7))
(define k "mykey")
(hash-set! h (string-copy k) 12345)
(display (hash-ref h k)) (newline)
(display h) (newline)
(gc)
(display (hash-ref h k)) (newline)
run with "guile -s foo.scm" produces
12345
#wh(() () () () () ((mykey . 12345)) ())
12345
whereas I might have expected the gc to have collected the entry just
set, making the second hash-ref give #f rather than 12345. This is
what happens if the (display h) is not present.
I don't really know if this is a bug, or ignorance on my part, but it
seemed more than a little strange.
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