[eximius]

My goodness! A Lattice (not the linear algebra kind, the abstract algebra kind) being used in the wild? I genuinely never thought I'd see those again outside my analysis textbook.

Ticki does really great work in Rust. I think the only thing he's doing that I disagree with is his RFC for a keyword for dynamic dispatch (all we really need is to distinguish trait objects - dynamic dispatch is just the symptom).

[yomritoyj]

Lattices are used to provide a theoretical basis for dataflow analysis in compilers. See Chapter 9 of Aho et al.'s book on compilers.

Ordered sets also occur in denotational semantics http://homepage.cs.uiowa.edu/~slonnegr/plf/Book/Chapter10.pd...

[asQuirreL]

Lattices and the associated Galois connections are used quite a bit in the Abstract Interpretation school of program analysis [1].

[1]: https://en.wikipedia.org/wiki/Abstract_interpretation

[the8472]

Seems to be common among compiler theory people

http://www.cliffc.org/blog/2012/03/24/too-much-theory-part-3...