exit_function - strange behavior

[Tycho Kirchner <tychokirchner@xxxxxxx>]

Dear zsh-maintainers,

first of all, I'm not a mail-subscriber but please respond to this email 
anyway ^_^

In the function doc for zshexit it states:
> Executed at the point where the main shell is about to exit normally. 
This is not called by exiting subshells...

Having read that the following session yields a surprising result (at 
least for me):


debian-dell% echo $ZSH_VERSION # Running on Debian Buster
5.8.0.2-dev
debian-dell% __zshrc_exit(){ echo "__zshrc_exit in subshell 
$ZSH_SUBSHELL with $?"; }
debian-dell% zshexit_functions+=(__zshrc_exit)
debian-dell% ( echo foo )
foo
debian-dell% ( exit 123 )
__zshrc_exit in subshell 1 with 123  # <---
debian-dell%


On the other hand the exit function seems to be not called for the main 
shell, when a subshell called 'exit' immediately before:


debian-dell% zsh -f -c '__zshrc_exit(){ echo "__zshrc_exit in subshell 
$ZSH_SUBSHELL with $?"; };  zshexit_functions+=(__zshrc_exit);  (exit 123);'
__zshrc_exit in subshell 1 with 123
debian-dell%


In case that this is desired behavior, how would one execute custom code 
*only* on exit of the main-shell?


Thanks in advance
Kind regards
Tycho Kirchner