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Rust needs an official specification
(tweedegolf.nl)
Welcome to the Rust community! This is a place to discuss about the Rust programming language.
Credits
You can say the Rust implementation is wrong if it doesn't conform to the Reference. That is not the same as "you personally disagree with the behavior."
Rust's guarantees about the behavior of safe code are far stronger than anything C or C++ provides, with or without a formal spec.