haskell@gentoo.org Gentoo Haskell Enable the extra internal checks. A queue that is push/pop on one end and pop-only on the other. These are commonly used for work-stealing. This implementation derives directly from the pseudocode in the 2005 SPAA paper: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.170.1097&rep=rep1&type=pdf