`clippy::zombie_processes`

Wait on the child process or otherwise reap it before the handle is dropped.

What it reads

Clippy, with the compiler behind it. The only pass that compiles.

Ordinary defect.

The tier bounds how severe a rule may be; its category bounds the tier.

Turn it off, or make it blocking, without touching the code it flags:

rust-doctor --rule clippy::zombie_processes=off .
rust-doctor --rule clippy::zombie_processes=error .