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Support dynamically sized field in error #375

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merged 2 commits into from
Nov 8, 2024
Merged

Support dynamically sized field in error #375

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8e8e273
Add test of dynamically sized error type
dtolnay Nov 8, 2024
24c04da
Support dynamically sized field in error
dtolnay Nov 8, 2024
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4 changes: 2 additions & 2 deletions src/display.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@ pub trait AsDisplay<'a>: Sealed {

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

Expand Down Expand Up @@ -44,7 +44,7 @@ impl<'a> AsDisplay<'a> for PathBuf {

#[doc(hidden)]
pub trait Sealed {}
impl<T: Display> Sealed for &T {}
impl<T: Display + ?Sized> Sealed for &T {}
#[cfg(feature = "std")]
impl Sealed for Path {}
#[cfg(feature = "std")]
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7 changes: 7 additions & 0 deletions tests/test_path.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,13 @@ enum EnumPathBuf {
Read(PathBuf),
}

#[derive(Error, Debug)]
#[error("{tail}")]
pub struct UnsizedError {
pub head: i32,
pub tail: str,
}

fn assert<T: Display>(expected: &str, value: T) {
assert_eq!(expected, value.to_string());
}
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