macro
boot.janet on line 1184, 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".