Yikes. I'm profiling a production site and found that a Django template that takes nearly 7 seconds to render. Hoping it's a sneaky DB query
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TIL Rust has an ambiguity `if Foo {}` -- is `Foo` a value of type bool, or a struct?
Rust solves this by defining a grammar production 'any expression except struct literals' and using it in this position.
Integration tests are inherently scary. You want to make them as similar as possible to your production environment, which massively increases the risk that one day they will talk to production directly.
JITs are blackboxes that can make it hard to reason about performance in production: