log

1 files changed, 7 insertions, 0 deletions

diff --git a/log.md b/log.md
index 8111653..389cd30 100644
--- a/log.md
+++ b/log.md
@@ -446,3 +446,10 @@ There is an issue with `revtwice.icl`; at some point in the garbage collector
 Fixed an issue where empty labels like `_cycle_in_spine` in `_system.abc` got a
 `nop`, which failed because then `__reserve` didn't have a `.long 0` right
 before it (cg `f64b035`).
+
+### 2016-11-16
+
+The compacting collector has a **problem**, for example with `./twice -h 1k -gc
+-st`.  It is difficult to find programs that have this problem, since the
+compacting collector is only used when the copying collector is deemed
+inefficient (when we would have to copy too much, copying is inefficient).