tree: debug massive gc problems.

The tree module doesn't observe generational GC correctness;
it assigns objects into other objects using ordinary
assignment.

* tests/010/tree.tl (tree_iter): New member, tree.
This is initialized to null for iterators on the stack.
dynamic iterator, we need this to be a back-pointer to the
dynamic iterator.
(tree_iter_init): Add parameter to initializer to set up the
back-pointer.
(set_left, set_right, set_key): Use set macro instead of
ordinary assignment.
(tn_find_next): Use set macro to add node to path.
(tn_flatten, tn_build_tree): Use set macro.
(tr_rebuild, tr_rebuild_scapegoat, tr_insert, tr_do_delete),
tr_delete): Use set macro. Take a tree argument so we can use
set macro on tr->root.
(tree_insert): Use set macro. Pass 0 to tree_iter_init
initializer macro.
(tree_delete_node): Pass tree to tr_delete.
(tree_equal_op, tree_print_op, tree_hash_op): Pass 0 to
tree_iter_init initializer macro.
(tree-begin): Rearrange construction for GC correctness: avoid
storing pointers into not-yet-reachable structure.

1 files changed, 0 insertions, 0 deletions

diff --git a/tests/010/tree.tl b/tests/010/tree.tl
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/tests/010/tree.tl