-
Neccesary for implementing 'tee' like behavior. See - http://comments.gmane.org/gmane.comp.lang.haskell.libraries/21373 - https://ghc.haskell.org/trac/ghc/ticket/8943 for more details.
0246baf9
To find the state of this project's repository at the time of any of these versions, check out the tags.