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use nix_compat_derive::NixDeserialize; #[derive(NixDeserialize)] #[nix(try_from = "u64")] pub struct Test; impl TryFrom<u64> for Test { type Error = (); fn try_from(value: u64) -> Result<Test, Self::Error> { if value == 42 { Ok(Test) } else { Err(()) } } } fn main() {}