| //@ run-pass |
| #![allow(warnings)] |
| |
| #[derive(Debug)] |
| pub struct Foo<T>(pub T); |
| |
| use std::fmt; |
| |
| impl<T> Field for T {} |
| impl<T> Finish for T {} |
| impl Dt for &mut fmt::Formatter<'_> {} |
| |
| pub trait Field { |
| fn field(&self, _: impl Sized) { |
| panic!("got into field"); |
| } |
| } |
| pub trait Finish { |
| fn finish(&self) -> Result<(), std::fmt::Error> { |
| panic!("got into finish"); |
| } |
| } |
| pub trait Dt { |
| fn debug_tuple(&self, _: &str) { |
| panic!("got into debug_tuple"); |
| } |
| } |
| |
| fn main() { |
| let foo = Foo(()); |
| assert_eq!("Foo(())", format!("{:?}", foo)); |
| } |
