ezyang’s blog

the arc of software bends towards understanding


Polymorphic variants in Ur/Web

This document explains how polymorphic variants in Ur/Web work. It was written because the official tutorial has no mention of them, the manual only devotes a paragraph to the topic, and there are some useful tricks for dealing with them that I picked up while wrangling with them in Logitext. What are polymorphic variants? Polymorphic […]

  • July 29, 2012