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