| #![allow(dead_code)] |
| #![deny(unused_variables)] // We used to generate warning: unused variable: `f` |
| |
| #[cfg(feature = "use_core")] |
| extern crate core; |
| |
| #[macro_use] |
| extern crate derivative; |
| |
| use std::fmt; |
| |
| #[derive(Derivative)] |
| #[derivative(Debug)] |
| enum A {} |
| #[derive(Derivative)] |
| #[derivative(Debug)] |
| enum B { V1, V2, V3 } |
| |
| #[derive(Derivative)] |
| #[derivative(Debug)] |
| enum C { V1(isize), V2(B), V3(String) } |
| |
| #[derive(Derivative)] |
| #[derivative(Debug)] |
| enum D { V1{ a: isize } } |
| |
| #[derive(Derivative)] |
| #[derivative(Debug)] |
| struct E; |
| #[derive(Derivative)] |
| #[derivative(Debug)] |
| struct F(isize); |
| #[derive(Derivative)] |
| #[derivative(Debug)] |
| struct G(isize, isize); |
| #[derive(Derivative)] |
| #[derivative(Debug)] |
| struct H { a: isize } |
| #[derive(Derivative)] |
| #[derivative(Debug)] |
| struct I { a: isize, b: isize } |
| #[derive(Derivative)] |
| #[derivative(Debug)] |
| struct J(Custom); |
| |
| struct Custom; |
| impl fmt::Debug for Custom { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| write!(f, "yay") |
| } |
| } |
| |
| trait ToDebug { |
| fn to_show(&self) -> String; |
| } |
| |
| impl<T: fmt::Debug> ToDebug for T { |
| fn to_show(&self) -> String { |
| format!("{:?}", self) |
| } |
| } |
| |
| #[test] |
| fn main() { |
| assert_eq!(B::V1.to_show(), "V1".to_string()); |
| assert_eq!(B::V2.to_show(), "V2".to_string()); |
| assert_eq!(C::V1(3).to_show(), "V1(3)".to_string()); |
| assert_eq!(C::V2(B::V2).to_show(), "V2(V2)".to_string()); |
| assert_eq!(D::V1{ a: 2 }.to_show(), "V1 { a: 2 }".to_string()); |
| assert_eq!(E.to_show(), "E".to_string()); |
| assert_eq!(F(3).to_show(), "F(3)".to_string()); |
| assert_eq!(G(3, 4).to_show(), "G(3, 4)".to_string()); |
| assert_eq!(I{ a: 2, b: 4 }.to_show(), "I { a: 2, b: 4 }".to_string()); |
| assert_eq!(J(Custom).to_show(), "J(yay)".to_string()); |
| } |