Here `Result` is very likely not the standard library type, because `std::result::Result` has two generic types for Ok and Err. It will be a partial alias to `Result<T, Error>` where `Error` is used throughout the entire code base to simplify the error handling. (The same pattern occurs in `std::io::{Result, Error}` in the standard library.)

Making `Result` a built-in syntax will disallow such freedom, and Zig has whole dedicated features to tackle problems solved by having `Result` just a normal type. Everything here is just a trade-off and both Rust and Zig have reasonable solutions for their use cases.