Coq offers two mechanism that are suited to solve this task: typeclasses and canonical structures.
Both can be instrumented in different ways to obtain a (more or less) convenient-to-use algebraic hierarchy.
A common approach using typeclasses is the ["unbundled" approach by Bas Spitters and Eelis van der Weegen](https://arxiv.org/abs/1102.1323).
-However, as [has been observed before](https://pastel.archives-ouvertes.fr/pastel-00649586), and as learned the hard way in the Coq formalization of the [original Iris paper](http://iris-project.org/pdfs/2015-popl-iris1-final.pdf), this approach quickly leads to terms that seem to be exponential in size.
+However, as [has been observed before](https://pastel.archives-ouvertes.fr/pastel-00649586), and as learned the hard way in the Coq formalization of the [original Iris paper](https://iris-project.org/pdfs/2015-popl-iris1-final.pdf), this approach quickly leads to terms that seem to be exponential in size.
My current research project -- and the main topic of my PhD thesis -- is about developing a *semantic model* of the [Rust programming language](https://www.rust-lang.org/) and, most importantly, its type system.
Rust is an attempt of Mozilla to find a sweet spot in the design space of programming languages: A language that provides low-level resource management (making it a systems language), is convenient for programmers and guards against memory errors and thread unsafety.
-Other have [said](https://www.youtube.com/watch?v=O5vzLKg7y-k) and [written](http://www.oreilly.com/programming/free/files/why-rust.pdf) a lot on why we need such a language, so I won't lose any more words on this.
+Other have [said](https://www.youtube.com/watch?v=O5vzLKg7y-k) and [written](https://www.oreilly.com/programming/free/files/why-rust.pdf) a lot on why we need such a language, so I won't lose any more words on this.
Let me just use this opportunity for a shameless plug: If you are curious and want to learn Rust, check out [Rust-101](https://www.ralfj.de/projects/rust-101/main.html), a hands-on Rust tutorial I wrote.
I am going to assume some basic familiarity with Rust in the following.
(Though, as you can see, I had to send them a picture, which was certainly the least pleasant part of this. ;)
PS: It seems I have consistent bad luck with my POPL talk slots, because my talk
-is [again](http://popl.mpi-sws.org/2015/program.html) in the very last session
+is [again](https://popl.mpi-sws.org/2015/program.html) in the very last session
of the conference. This time, in fact, it's the
[very last talk](https://popl18.sigplan.org/program/program-POPL-2018?date=Fri%2012%20Jan%202018)
of the main track. Maybe some people read this interview and consider staying
Notice that I am just the messenger here, the bug was actually found by [Hai](https://people.mpi-sws.org/~haidang/) and [Jacques-Henri](https://jhjourdan.mketjh.fr/).
Still, I'd like to use this opportunity to talk a bit about weak memory, synchronization and data races.
-This is just a primer, there are tons of resources on the web that go into more detail (for example [here](http://preshing.com/20120913/acquire-and-release-semantics/)).
+This is just a primer, there are tons of resources on the web that go into more detail (for example [here](https://preshing.com/20120913/acquire-and-release-semantics/)).
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