#![feature(rustc_private)] //@ edition: 2021 // Checks the error messages produced by `#[derive(TryFromU32)]`. extern crate rustc_macros; use rustc_macros::TryFromU32; #[derive(TryFromU32)] struct MyStruct {} //~ type is not an enum #[derive(TryFromU32)] enum NonTrivial { A, B(), C {}, D(bool), //~ enum variant cannot have fields E(bool, bool), //~ enum variant cannot have fields F { x: bool }, //~ enum variant cannot have fields G { x: bool, y: bool }, //~ enum variant cannot have fields } fn main() {}