"Since I'd worked for days to find somewhere to insert a single char, I also added a comment" https://neilmitchell.blogspot.com/2013/02/chasing-space-leak-in-shake.html (fixing space leaks)
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One interesting aspect of collecting coins in a platformer like mario: it makes the level stateful.
You can see if you've been somewhere before based on whether there are coins present.
When writing long-lived programs (daemons etc) in Rust, I find myself asking *where* I should put data.
In a GC'd language it's just "I have a string" but Rust forces me to find somewhere to put it.
You do get a performance benefit for this work though.
Chekhov's repro: If a line of code is included in a bug report, it should contribute to the debugging somewhere.