* libguile/weak-table.h:
* libguile/weak-table.c (scm_weak_table_putq_x)
(scm_weak_table_remq_x, scm_weak_table_clear_x)
(scm_weak_table_for_each): Declare these as returning void instead of
SCM.
* libguile/hashtab.c (scm_hashq_set_x, scm_hashq_remove_x)
(scm_hashv_set_x, scm_hashv_remove_x)
(scm_hash_set_x, scm_hash_remove_x)
(scm_hashx_set_x, scm_hashx_remove_x):
(scm_hash_for_each): For weak tables, have the set! functions return
the values, as they used to do. Have remove! functions return #f,
indicating the lack of a handle. Shim around for-each to return
unspecified, even though that wasn't yet a problem.
* test-suite/tests/weaks.test: Add a test.
* libguile/hashtab.c:
* libguile/hashtab.h: Reimplement the weak hash table implementation in
terms of weak tables. All is well except for the horrific hack for
hashx tables.
* libguile/weak-table.h:
* libguile/weak-table.c (scm_make_weak_key_hash_table)
(scm_make_weak_value_hash_table, scm_make_doubly_weak_hash_table)
(scm_weak_key_hash_table_p, scm_weak_value_hash_table_p)
(scm_doubly_weak_hash_table_p): Move these definitions here.
* libguile/weak-table.c:
* libguile/weak-table.h: New files, implementing open-addressed weak
hash tables, similar to the implementation of weak sets. This will
let us remove weak pairs.
* libguile.h:
* libguile/Makefile.am:
* libguile/evalext.c:
* libguile/gc.c:
* libguile/init.c:
* libguile/print.c:
* libguile/tags.h: Update all the pieces for the new files and tc7.
