httprepl is a great tool for making HTTP queries to REST endpoints from Emacs. Impressively, it is implemented using parser combinators!
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There's a class of performance bugs that you can feel.
Today I inadvertently implemented "Schlemiel the Painter's algorithm", and it's obvious: performance was great at first, and then it gradually deteriorates.
Today I learnt that the Glamorous Toolkit has its own VM, implemented in Rust, which wraps the Pharo smalltalk environment!
I'm slightly surprised that Rust has implemented the Default trait for booleans: https://doc.rust-lang.org/src/core/default.rs.html#205
The default is false, but it feels very arbitrary. Maybe it makes more sense next to integers, where the default value is 0.