/rust/registry/src/index.crates.io-1949cf8c6b5b557f/thiserror-2.0.17/src/display.rs

Source
use core::fmt::Display;
#[cfg(feature = "std")]
use std::path::{self, Path, PathBuf};

#[doc(hidden)]
pub trait AsDisplay<'a>: Sealed {
    // TODO: convert to generic associated type.
    // https://github.com/dtolnay/thiserror/pull/253
    type Target: Display;

    fn as_display(&'a self) -> Self::Target;
}

impl<'a, T> AsDisplay<'a> for &T
where
    T: Display + ?Sized + 'a,
{
    type Target = &'a T;

    fn as_display(&'a self) -> Self::Target {
        *self
    }
}

#[cfg(feature = "std")]
impl<'a> AsDisplay<'a> for Path {
    type Target = path::Display<'a>;

    #[inline]
    fn as_display(&'a self) -> Self::Target {
        self.display()
    }
}

#[cfg(feature = "std")]
impl<'a> AsDisplay<'a> for PathBuf {
    type Target = path::Display<'a>;

    #[inline]
    fn as_display(&'a self) -> Self::Target {
        self.display()
    }
}

#[doc(hidden)]
pub trait Sealed {}
impl<T: Display + ?Sized> Sealed for &T {}
#[cfg(feature = "std")]
impl Sealed for Path {}
#[cfg(feature = "std")]
impl Sealed for PathBuf {}

// Add a synthetic second impl of AsDisplay to prevent the "single applicable
// impl" rule from making too weird inference decision based on the single impl
// for &T, which could lead to code that compiles with thiserror's std feature
// off but breaks under feature unification when std is turned on by an
// unrelated crate.
#[cfg(not(feature = "std"))]
mod placeholder {
    use super::{AsDisplay, Sealed};
    use core::fmt::{self, Display};

    #[allow(dead_code)]
    pub struct Placeholder;

    impl<'a> AsDisplay<'a> for Placeholder {
        type Target = Self;

        #[inline]
        fn as_display(&'a self) -> Self::Target {
            Placeholder
        }
    }

    impl Display for Placeholder {
        fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result {
            unreachable!()
        }
    }

    impl Sealed for Placeholder {}
}

Line	Count	Source
1		use core::fmt::Display;
2		#[cfg(feature = "std")]
3		use std::path::{self, Path, PathBuf};
4
5		#[doc(hidden)]
6		pub trait AsDisplay<'a>: Sealed {
7		// TODO: convert to generic associated type.
8		// https://github.com/dtolnay/thiserror/pull/253
9		type Target: Display;
10
11		fn as_display(&'a self) -> Self::Target;
12		}
13
14		impl<'a, T> AsDisplay<'a> for &T
15		where
16		T: Display + ?Sized + 'a,
17		{
18		type Target = &'a T;
19
20	0	fn as_display(&'a self) -> Self::Target {
21	0	*self
22	0	} Unexecuted instantiation: <&alloc::boxed::Box<hickory_proto::error::ProtoError> as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&alloc::boxed::Box<hickory_proto::op::query::Query> as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&hickory_proto::rr::record_type::RecordType as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&hickory_proto::dnssec::proof::Proof as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&hickory_proto::dnssec::algorithm::Algorithm as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&str as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&u8 as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&usize as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&u16 as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&hickory_proto::rr::domain::name::Name as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&hickory_proto::op::query::Query as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&hickory_proto::error::ProtoError as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&hickory_proto::error::DnsError as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&hickory_proto::serialize::binary::decoder::DecodeError as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&alloc::string::String as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&hickory_proto::op::response_code::ResponseCode as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&alloc::sync::Arc<std::io::error::Error> as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&aws_lc_rs::error::KeyRejected as thiserror::display::AsDisplay>::as_display Unexecuted instantiation: <&aws_lc_rs::error::Unspecified as thiserror::display::AsDisplay>::as_display
23		}
24
25		#[cfg(feature = "std")]
26		impl<'a> AsDisplay<'a> for Path {
27		type Target = path::Display<'a>;
28
29		#[inline]
30		fn as_display(&'a self) -> Self::Target {
31		self.display()
32		}
33		}
34
35		#[cfg(feature = "std")]
36		impl<'a> AsDisplay<'a> for PathBuf {
37		type Target = path::Display<'a>;
38
39		#[inline]
40		fn as_display(&'a self) -> Self::Target {
41		self.display()
42		}
43		}
44
45		#[doc(hidden)]
46		pub trait Sealed {}
47		impl<T: Display + ?Sized> Sealed for &T {}
48		#[cfg(feature = "std")]
49		impl Sealed for Path {}
50		#[cfg(feature = "std")]
51		impl Sealed for PathBuf {}
52
53		// Add a synthetic second impl of AsDisplay to prevent the "single applicable
54		// impl" rule from making too weird inference decision based on the single impl
55		// for &T, which could lead to code that compiles with thiserror's std feature
56		// off but breaks under feature unification when std is turned on by an
57		// unrelated crate.
58		#[cfg(not(feature = "std"))]
59		mod placeholder {
60		use super::{AsDisplay, Sealed};
61		use core::fmt::{self, Display};
62
63		#[allow(dead_code)]
64		pub struct Placeholder;
65
66		impl<'a> AsDisplay<'a> for Placeholder {
67		type Target = Self;
68
69		#[inline]
70		fn as_display(&'a self) -> Self::Target {
71		Placeholder
72		}
73		}
74
75		impl Display for Placeholder {
76		fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result {
77		unreachable!()
78		}
79		}
80
81		impl Sealed for Placeholder {}
82		}

Coverage Report

Created: 2025-11-16 06:35