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Document minimal required version of Rust #84

Open bonzini opened 4 years ago

bonzini commented 4 years ago

vm-memory has some code that is gated behind features, or using external crates, in order to support Rust versions earlier than 1.34.0 (which lack AtomicU* types and TryFrom). It would be nice to have a clear statement of the earliest supported version of the language, so that people know when such workarounds have become obsolete.