`clippy::await_holding_lock`

Drop the guard before the await point, or use a lock designed to be held across await.

What it reads

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

Serious: worth interrupting other work for.

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