All of Debian's patches for rustc: bugfixes, tweaks for the Debian environment, and even some reproducibility improvements.
https://sources.debian.org/patches/rustc/1.40.0+dfsg1-5/
Many have a separate comment, which is really helpful.
miniblog.
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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!
The niche of short, environment-specific scripts, and the consequences for programming language design choices:
Achievement unlocked: when trying to work around an Emacs bug with long lines and pipes: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=6149#19 I hit a bug in Cask, the Emacs environment manager! https://github.com/cask/cask/pull/596
Software is hard.