scopeguard-lite vs scopeguard vs guarden

A lightweight way to defer execution of a block to the end of the scope, and to run code during an unwind.

A RAII scope guard that will run a given closure when it goes out of scope, even if the code between panics (assuming unwinding panic). Defines the macros `defer!`, `defer_on_unwind!`, `defer_on_success!` as shorthands for guards with one of the implemented strategies.

Zero-cost abstractions for scoped guards, deferred execution, and async task detachment