defdyn

    macro
    boot.janet on line 157, column 1

    (defdyn alias & more)

    Define an alias for a keyword that is used as a dynamic binding. 
    The alias is a normal, lexically scoped binding that can be used 
    instead of a keyword to prevent typos. `defdyn` does not set 
    dynamic bindings or otherwise replace `dyn` and `setdyn`. The alias 
    *must* start and end with the `*` character, usually called 
    "earmuffs".