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I'd rephrase this as Rust enabling reasoning about program validity locally, while many other languages (regardless of type system, e.g. C, C++ and Python/Ruby/

I'd rephrase this as Rust enabling reasoning about program validity locally, while many other languages (regardless of type system, e.g. C, C++ and Python/Ruby/JS are typical examples) don't allow you to reason about program validity in localized increments. This promotes more modular designs, clearer interface boundaries and less "change anxiety".

kaba0 3y ago
> enabling reasoning about program validity locally About certain few properties only. It is impossible in the general case. I agree regarding “change anxiety” compared to dynamic languages, but that’s just static typing. Due to lifetime annotations leaking into API boundaries, the rest is not true though.