Function run 

pub unsafe fn run()

🔬This is a nightly-only experimental API. (thread_local_internals)

Available on target_thread_local and not (target_family=wasm and non-target feature atomics) only.

The guard module contains platform-specific functions which will run this function on thread exit if guard::enable has been called.

Safety

May only be run on thread exit to guarantee that there are no live references to TLS variables while they are destroyed.