patch 8.2.3901: Vim9: Cannot set 'cpo' in main .vimrc if using Vim9 script
Problem: Vim9: Cannot set 'cpo' in main .vimrc if using Vim9 script.
Solution: Do not restore 'cpo' at the end of the main .vimrc.
diff --git a/runtime/doc/vim9.txt b/runtime/doc/vim9.txt
index 6c142a4..ced0c7d 100644
--- a/runtime/doc/vim9.txt
+++ b/runtime/doc/vim9.txt
@@ -1402,6 +1402,7 @@
The original value of 'cpoptions' is restored at the end of the script, while
flags added or removed in the script are also added to or removed from the
original value to get the same effect. The order of flags may change.
+In the |vimrc| file sourced on startup this does not happen.
*vim9-mix*
There is one way to use both legacy and Vim9 syntax in one script file: >