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Jaro Reinders

@jaror@social.edu.nl
mastodon 4.5.8

PhD student at Delft University of Technology 🎓 in the @DelftPL group. Trying to build correct compilers from modular building blocks 🧩 in #Agda.

I'm also a #Haskell enthusiast, #GHC contributor, and a member of the GHC Steering Committee and the Core Libraries Committee.

Other than that I'd like to play some #folk guitar 🎶 and recently obtained a banjo 🪕. I also appreciate playing with language 📝 #lightverse.
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Joined February 25, 2023
pronouns:
he/him
github:
https://github.com/noughtmare
homepage:
https://jaror.nl (WIP)
orcid:
https://orcid.org/0000-0002-6837-3757

Posts

Open post
In reply to
jaror
Jaro Reinders
@jaror@social.edu.nl

PhD student at Delft University of Technology 🎓 in the @DelftPL group. Trying to build correct compilers from modular building blocks 🧩 in #Agda. I'm also a #Haskell enthusiast, #GHC contributor, and a member of the GHC Steering Committee and the Core Libraries Committee. Other than that I'd like to play some #folk guitar 🎶 and recently obtained a banjo 🪕. I also appreciate playing with language 📝 #lightverse.

social.edu.nl
Jaro Reinders
Jaro Reinders
@jaror@social.edu.nl

PhD student at Delft University of Technology 🎓 in the @DelftPL group. Trying to build correct compilers from modular building blocks 🧩 in #Agda. I'm also a #Haskell enthusiast, #GHC contributor, and a member of the GHC Steering Committee and the Core Libraries Committee. Other than that I'd like to play some #folk guitar 🎶 and recently obtained a banjo 🪕. I also appreciate playing with language 📝 #lightverse.

social.edu.nl
@jaror@social.edu.nl · Apr 09, 2026
@kottke if only all software was required to include the tools for maintenance, diagnosis, and repairs.

Ever wondered why there are no third party repair shops for software? It's because almost all software is locked up like John Deere's tractors. Only the owner of the software is allowed to fix issues and it is not you.
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Open post
In reply to
jaror
Jaro Reinders
@jaror@social.edu.nl

PhD student at Delft University of Technology 🎓 in the @DelftPL group. Trying to build correct compilers from modular building blocks 🧩 in #Agda. I'm also a #Haskell enthusiast, #GHC contributor, and a member of the GHC Steering Committee and the Core Libraries Committee. Other than that I'd like to play some #folk guitar 🎶 and recently obtained a banjo 🪕. I also appreciate playing with language 📝 #lightverse.

social.edu.nl
Jaro Reinders
Jaro Reinders
@jaror@social.edu.nl

PhD student at Delft University of Technology 🎓 in the @DelftPL group. Trying to build correct compilers from modular building blocks 🧩 in #Agda. I'm also a #Haskell enthusiast, #GHC contributor, and a member of the GHC Steering Committee and the Core Libraries Committee. Other than that I'd like to play some #folk guitar 🎶 and recently obtained a banjo 🪕. I also appreciate playing with language 📝 #lightverse.

social.edu.nl
@jaror@social.edu.nl · Mar 23, 2026
@foxy

0) Netherlands
1) 4 years, assumes Master's
2) 0*
3) 0

* We do need 45 "graduate school credits". These are split into: 15 credits for things like writing and presentation courses where 1 credit is basically a full day course with some homework, 15 credits for summer schools where 1 credit is one day of a summer school, and 15 "learning on the job" credits which you get for supervising students, giving a guest lecture, writing a paper, etc.
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Open post
In reply to
jaror
Jaro Reinders
@jaror@social.edu.nl

PhD student at Delft University of Technology 🎓 in the @DelftPL group. Trying to build correct compilers from modular building blocks 🧩 in #Agda. I'm also a #Haskell enthusiast, #GHC contributor, and a member of the GHC Steering Committee and the Core Libraries Committee. Other than that I'd like to play some #folk guitar 🎶 and recently obtained a banjo 🪕. I also appreciate playing with language 📝 #lightverse.

social.edu.nl
Jaro Reinders
Jaro Reinders
@jaror@social.edu.nl

PhD student at Delft University of Technology 🎓 in the @DelftPL group. Trying to build correct compilers from modular building blocks 🧩 in #Agda. I'm also a #Haskell enthusiast, #GHC contributor, and a member of the GHC Steering Committee and the Core Libraries Committee. Other than that I'd like to play some #folk guitar 🎶 and recently obtained a banjo 🪕. I also appreciate playing with language 📝 #lightverse.

social.edu.nl
@jaror@social.edu.nl · Dec 15, 2025
@jesper @anuytstt I'm lost at this sentence in the introduction:

> For example the parametricity of a function f : A → B is a proof that f maps related inputs in A to related outputs in B, i.e. f is a morphism of reflexive graphs.

Which relations on A and B are we talking about?
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Open post
In reply to
jaror
Jaro Reinders
@jaror@social.edu.nl

PhD student at Delft University of Technology 🎓 in the @DelftPL group. Trying to build correct compilers from modular building blocks 🧩 in #Agda. I'm also a #Haskell enthusiast, #GHC contributor, and a member of the GHC Steering Committee and the Core Libraries Committee. Other than that I'd like to play some #folk guitar 🎶 and recently obtained a banjo 🪕. I also appreciate playing with language 📝 #lightverse.

social.edu.nl
Jaro Reinders
Jaro Reinders
@jaror@social.edu.nl

PhD student at Delft University of Technology 🎓 in the @DelftPL group. Trying to build correct compilers from modular building blocks 🧩 in #Agda. I'm also a #Haskell enthusiast, #GHC contributor, and a member of the GHC Steering Committee and the Core Libraries Committee. Other than that I'd like to play some #folk guitar 🎶 and recently obtained a banjo 🪕. I also appreciate playing with language 📝 #lightverse.

social.edu.nl
@jaror@social.edu.nl · Oct 15, 2025
@jonmsterling I'm out of the loop on this one. What's wrong with pure type systems? Is it that it presents a general framework while only a few instantiations are really interesting (and perhaps it does not cover all interesting systems)?
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