patch 8.2.2070: can't get the exit value in VimLeave(Pre) autocommands
Problem: Can't get the exit value in VimLeave or VimLeavePre autocommands.
Solution: Add v:exiting like in Neovim. (Yegappan Lakshmanan, closes #7395)
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 72a66d5..6f594ab 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1850,6 +1850,13 @@
< Note: if another deadly signal is caught when v:dying is one,
VimLeave autocommands will not be executed.
+ *v:exiting* *exiting-variable*
+v:exiting Vim exit code. Normally zero, non-zero when something went
+ wrong. The value is v:null before invoking the |VimLeavePre|
+ and |VimLeave| autocmds. See |:q|, |:x| and |:cquit|.
+ Example: >
+ :au VimLeave * echo "Exit value is " .. v:exiting
+<
*v:echospace* *echospace-variable*
v:echospace Number of screen cells that can be used for an `:echo` message
in the last screen line before causing the |hit-enter-prompt|.