Spurious recursive trap invocation warning

[Martijn Dekker]

The current git version of bash (at least on x86_64-apple-darwin18.7.0) 
gives a spurious warning about a recursive trap invocation when running 
the following more than once on an interactive shell. The trap unsets 
itself before resending the signal, so there should be no recursive 
invocation.

bash-5.0$ echo $BASH_VERSION
5.0.11(1)-maint
bash-5.0$ trap 'echo int; trap - INT; kill -s INT $$' INT; kill -s INT $$
int

bash-5.0$ trap 'echo int; trap - INT; kill -s INT $$' INT; kill -s INT $$
bash: warning: run_pending_traps: recursive invocation while running 
trap for signal 2
int

bash-5.0$ trap 'echo int; trap - INT; kill -s INT $$' INT; kill -s INT $$
bash: warning: run_pending_traps: recursive invocation while running 
trap for signal 2
int

Thanks and happy new year,

- M.

--
modernish -- harness the shell
https://github.com/modernish/modernish