Macro websocket::async::futures::task_local

macro_rules! task_local {
    ( static $ NAME : ident : $ t : ty = $ e : expr ) => { ... };
}

A macro to create a static of type LocalKey

This macro is intentionally similar to the thread_local!, and creates a static which has a with method to access the data on a task.

The data associated with each task local is per-task, so different tasks will contain different values.