stan-dev/stan — pull request #789 by alyst (2014-07-21 18:38:29+00:00)
Title: Add Frechet distribution

If X is Weibull-distributed, then 1/X would follow Frechet distribution.
So it might be useful to have `weibull`/`frechet` pair in Stan, just like the `gamma`/`inv_gamma` one.