Borrow-checking surprises

Jamie Brandon · 7 Apr 2026 · scattered-thoughts.net ↗

3 korrents from this piece

Jamie Brandon did not write this page.

Every claim below was made in this piece, quoted word for word and numbered in the order the piece makes them, so you can read it there rather than take our word for it. The sentence above each quote is our reading of the claim, not their wording. Each quote was checked against a stored copy of the page at build time; where the two differ, the quote is the fact.

Our reading
Most people who write Rust regularly are missing subtle details of how its borrow-checker actually works.

Their wordsI suspect most people who write rust regularly are missing these details too.
Our reading
Once an explanation is revealed, people tend to believe they already knew it, even when they did not.

Their wordsOnce you see the answer it's easy to believe that you already knew
Our reading
Rust is hard to learn because its borrow-checking rules have so many exceptions that people internalize the wrong simplified rules.

Their wordsWhile the core borrow-checking rules are simple, there are so many exceptions (admittedly for solid ergonomic reasons) that it's easy to internalize the wrong rules.