Day 1 at @poplconf had a bunch of interesting talks at VMCAI (Verification, Model Checking, and Abstract Interpretation). https://popl20.sigplan.org/home/VMCAI-2020
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"Example Driven Development" using Glamorous and Pharo Smalltalk: https://medium.com/feenk/an-example-of-example-driven-development-4dea0d995920
Tests returning values and composing is a really interesting model. It establishes structure and shows which test failure is the most 'fundamental'.
I'm having fun writing a simple type checker, but I'm learning firsthand why syntax-directed checking doesn't work. It prevents inference.
My checker catches real bugs, but it can't handle cases like this:
[1, 2].map(fun(x) { x + 1; })
I think I need bidirectional checking.
Designing UIs is such a hard problem.
Sometimes I try a bunch of options and I settle on "this one seems the least annoying".