Awesome Emacs package of the day: https://github.com/skeeto/impatient-mode -- live previews for HTML!
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Today I learnt about yamllint: if you're using YAML, you can at least ensure you're not suffering from the 'Norway problem':
The author of rust-analyzer discussing how language features help or hinder fast IDEs.
If you allow `from m import *` you can't analyse files in isolation, and it's even harder in Rust.
Excellent series on Self, both the programming model and the tool chain.
I love how opening an inspector on a value (e.g. nil) then shows a link to all occurrences of the value in other open inspectors!