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> but without the undefined behaviour This line of comments is rather silly, as it tries to compare implementations with a language specification described thr

> but without the undefined behaviour This line of comments is rather silly, as it tries to compare implementations with a language specification described through international standards. Apples and oranges. Mozilla's rust implementation has no undefined behavior because it isn't even defined in any standard document nor are there many competing commercial teams developing rust implementations independently of each other. Complaining that C has undefined behavior but rust hasn't makes as much sense as complaining that C has undefined behavior but MS Visual C 2015 doesn't.

steveklabnik 8y ago
> Mozilla's rust implementation has no undefined behavior because it isn't even defined in any standard document nor are there many competing commercial teams developing rust implementations independently of each other. This is not true. “No UB in safe Rust” is a guiding principle of the language design. (And there is a second implementation of everything but the borrow checker.) MS Visual C absolutely has UB.