Duplicate a handle in the parent region.
A handle to a finalizer that allows you to duplicate it to a parent region using "dup".
A mutable reference in the IO monad.
IO Actions for writing to standard output and and reading from standard input
A monad transformer in which scarce resources can be opened.
Purely functional mutable state threads.
Mutable array in state thread S containing values of type A.
Mutable variable in state thread S containing a value of type A.
A safe alternative to the
App trait in the Scala standard library.