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Rust needs an official specification
(tweedegolf.nl)
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That requires a complete picture and all possible use cases from the start. Initially when a language is new and hardly used there are much to benefit from flexibility and trying new concepts. Then as the language matures, a more formal process is needed to ensure stability. There is a reason these discussions comes now, since rust is in a very stable phase.
There might also just not be a single spec because the information is spread out over RFCs instead of being collected in a central location.