Update runtime files
diff --git a/runtime/doc/testing.txt b/runtime/doc/testing.txt
index d064dc1..44296f0 100644
--- a/runtime/doc/testing.txt
+++ b/runtime/doc/testing.txt
@@ -1,4 +1,4 @@
-*testing.txt* For Vim version 8.2. Last change: 2021 Aug 15
+*testing.txt* For Vim version 8.2. Last change: 2021 Dec 11
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -65,7 +65,8 @@
Like garbagecollect(), but executed right away. This must
only be called directly to avoid any structure to exist
internally, and |v:testing| must have been set before calling
- any function.
+ any function. This will not work when called from a :def
+ function, because variables on the stack will be freed.
test_garbagecollect_soon() *test_garbagecollect_soon()*